Archives: Quiz

The dorsal respiratory group in the medulla oblongata is involved with A.inspiration. B.expiration. C.breathing rhythm. D.both inspiration and expiration. The first step in the scientific method involves the formation of a(n) A.theory. B.law. C.experiment. D.hypothesis. Answer: D. Antihistamines would limit […]

What condition is caused by large amounts of nitrogen dissolving into the blood due to hyperbaric conditions? A.nitrogen narcosis B.oxygen toxicity C.decompression sickness D.emphysema _________ filaments are attached to dense bodies in smooth muscle cells. A.Actin B.Myosin C.Troponin D.Tropomyosin Answer: […]

Insulin secretion is stimulated by _____________ blood glucose concentrations. A.increased B.decreased C.unchanged Each somatic motor neuron with all the muscle fibers it innervates is a A.fascicle. B.varicosity. C.motor unit. D.sarcolemma. Answer: C. To go through glycolysis, _________ ATP per glucose […]

An axon will depolarize only if the membrane potential reaches between -70mV and -55mV. This follows the A. All-or-none law. B. recruitment law. C. graduated law. D. threshold law. What structure of a mature follicle is a barrier to sperm […]

Light is refracted the most by the A.cornea. B.aqueous humor. C.lens. D.vitreous humor. The movement of semen into the urethra is called A.emission. B.erection. C.ejaculation. D.ovulation. Answer: A. Over-secretion of growth hormone in children causes A.acromegaly. B.pituitary cachexia. C.gigantism. D.myxedema. […]

During skeletal muscle contraction, adjacent _________ are pulled closer together as the _______ between them shorten. A. A bands; I bands B. I bands; A bands C. Z disks; A bands D. Z disks; M lines Transmission of thermal sensations […]

Destruction of the pancreatic beta-cells would result in A.Cushing’s disease. B.Grave’s disease. C.diabetes mellitus. D.diabetes insipidus. The renal plasma clearance of a substance that is filtered but not reabsorbed or secreted is ___ the GFR. A.greater than B.less than C.equal […]

Poisoning the Na+/K+ pump would A. generate a more negative membrane potential. B. increase cellular permeability to Na+. C. inhibit secondary active transport. D. increase cellular permeability to K+. The major plasma protein is A.alpha globulin. B.beta globulin. C.fibrinogen. D.albumin. […]

Regeneration of CNS axons may be prevented in part by inhibitory proteins in the membranes of the A. myelin sheath. B. neurons. C. astrocytes. D. satellite cells. Which ion’s movements is responsible for repolarization? A. influx of K+ B. influx […]

Cardiogenic shock can result from A.myocardial infarction. B.increased cardiac output. C.increased sympathetic outflow to the heart. D.parasympathetic antagonists. The rate of diffusion is influenced by A. the concentration gradient. B. membrane permeability. C. membrane surface area. D. All apply. Answer: […]

What is the action of the binding of muscarine to its receptors in the digestive system? A. alpha subunits bind to K+ channels, close them, leading to depolarization. B. alpha subunits bind to K+ channels, open them, leading to hyperpolarization. […]

Which of the following components of energy expenditure is greatest in an average, sedentary adult? A.basal metabolic rate. B.adaptive thermogenesis. C.physical activity. D.None of the choices are correct. The vitamin D derivative calcipotriene is used to treat the skin condition […]

____________ is an acetylcholinesterase antagonist used to treat myasthenia gravis. A. Neostigmine B. Muscarine C. Naloxone D. Nitric oxide What ion is released by the fertilized egg that prevents polyspermy? A.Na+ B.K+ C.Cl— D.Ca2+ Answer: D. Within the blood vessels, […]

What determines how a regulatory molecule influences its target cell? A. polarity and solubility B. solubility and size C. size and polarity D. polarity, solubility, and size Blood clotting requires A.vitamin C. B.vitamin D. C.vitamin K. D.vitamin E. Answer: C. […]

Ketosis A.occurs when stored fats are rapidly degraded by the body. B.stimulates an increased blood pH. C.may lead to alkalosis. D.occurs as the concentration of ketones in the urine decreases. What enzyme is needed to prevent excessive accumulation of hydrogen […]

The reabsorption of Na+ in the proximal tubule creates an osmotic gradient for the diffusion of _____ to occur. A.Cl– B.H2O C.K+ D.All of the choices are correct. Which type of cone responds to short wavelengths of 420nm? A.blue cones […]

Where is the primary gustatory cortex? A.postcentral gyrus of the parietal lobe B.prefrontal cortex C.temporal lobe D.insula Which division of the nervous system innervates involuntary effectors? A. central nervous system B. somatic nervous system C. autonomic nervous system D. associative […]

_______ refer to muscle contractions that produce a shortening muscle with a constant contraction strength at a given load. A. Treppe contractions B. Isotonic contractions C. Twitch contractions D. Isometric contractions Stimulation of the hair cells of the vestibular apparatus […]

Which of the following is a layer of the renal corpuscle? A.glomerular visceral epithelium B.glomerular parietal epithelium C.glomerular endothelium D.All of the choices are correct. If PO2 and hemoglobin content of blood is normal, how much oxygen is the blood […]

Which transporters in the proximal tubule are polyspecific and transport small molecules of drugs and toxins to the ultrafiltrate? A.water transporters B.renal aquaporins C.organic anion transporters D.toxiporins Cardiovascular changes resulting from moderate exercise include A.increased total peripheral resistance. B.increased blood […]

The placental hormone which stimulates glucose sparing by maternal tissues is A.chorionic somatomammotropin. B.chorionic gonadotropin. C.progesterone. D.estrogen. Phagocytosis is important for A. body defense against foreign organic matter. B. promoting inflammation. C. removal of old and dying cells. D. All […]

The maternal contribution to the placenta is the A.decidua basalis. B.chorion frondosum. C.chorionic villi. D.yolk sac. Protein carrier mediated transport of molecules display A. specificity. B. competition. C. saturation. D. All apply. Answer: D. Which of the following is NOT […]

Breathing 100% oxygen will NOT A.significantly increase the oxygen delivery to tissues. B.increase the amount of oxygen in red blood cells. C.significantly increase the total oxygen content of whole blood. D.both increase the amount of oxygen in red blood cells […]

Insulin promotes cellular uptake of glucose by inserting these channels into plasma membranes. A.uncoupling protein B.glucagon C.Glut4 D.leptin A cell which is actively involved in the detoxification of chemicals would contain large quantities of A.ribosomes. B.mitochondria. C.peroxisomes. D.rough endoplasmic reticulum. […]

Which of the following would be found in normal somatic cells of women but not men? A.an X chromosome B.a Y chromosome C.a Barr body D.22 pairs of autosomal chromosomes What chemical is released by neutrophils that produces pus at […]

Destruction of which cell type in the fetus would affect adipocyte number in the adult? A.myoblasts B.neuroblasts C.epiblasts D.fibroblasts Expanded blood volume stimulates stretch receptors in the atria of the heart causing increased secretion of A.atrial natriuretic peptide. B.aldosterone. C.epinephrine. […]

How many ova are produced by oogenesis of one oogonia? A.one B.two C.four D.eight Steroid hormone influence on gene expression is known as A. genomic action. B. nongenomic action. C. dimerization. D. translocation. Answer: A. Norepinephrine and epinephrine open ____ […]

Which of the following is NOT a molecule of the electron transport system? A.coenzyme Q B.coenzyme A C.flavin mononucleotide (FMN) D.cytochrome b In a complete AV node block, A.no signals pass into the ventricles. B.the atria will be paced by […]

Neurohypophyseal secretion of __________ stimulates formation of concentrated urine. A.aldosterone B.renin C.antidiuretic hormone D.angiotensin I The brain and spinal cord comprise the A. central nervous system. B. peripheral nervous system. C. peripheral ganglia. D. spinal nerves. Answer: A. Which of […]

Which of the special senses is most closely linked with the limbic system? A.hearing B.olfaction C.taste D.vision Matrix metalloproteinases A. produce the basal lamina. B. synthesize collagen in the extracellular matrix. C. may be active in invasive cancer cells. D. […]

The _________________ conducts impulses from the AV node to branches which lead to the Purkinje fibers. A.AV valve B.ventricular septum C.AV bundle D.SA node What is produced when two diiodotyrosine molecules couple togther? A. triiodothyronine B. tetriodothyronine C. thyroxine D. […]

Insulin secretion is often normal in individuals with type I diabetes mellitus. Solutions containing a high concentration of hydrogen ions would maximally stimulate taste buds for sweet. Answer: FALSE Electrical synapses are functionally linked by tight junctions. Answer: FALSE Lipophilic […]

An atom or molecule that is oxidized is also a reducing agent. Active enzymes are often called zymogens. Answer: FALSE Parasympathetic stimulation increases the rate of passage of material in the small intestine. Answer: TRUE Hydrogen bonds form between the […]

The parasympathetic response to stimulation results in mass activation. Damage to the right motor cortex will generally mean motor problems on the right side of the body. Answer: FALSE Blood would clot more slowly in an individual with 100,000 platelets/mm3. […]

Receptor-mediated endocytosis would allow cells to selectively remove molecules from the extracellular fluid. Closure of the atrioventricular valves occurs at the end of diastole/beginning of systole. Answer: TRUE The same prostaglandin may produce different effects in different tissues. Answer: TRUE […]

The inability to chew would be associated with damage to the ophthalmic division of the trigeminal nerve. Preload is the amount of blood in the ventricles right before they begin to contract. Answer: TRUE Pulmonary blood pressure is higher than […]

Homeostasis is best described as a static, unchanging state of the internal environment. Blood flow in the brain changes as blood pressure changes. Answer: FALSE Damage to the Sertoli cells would result in the production of antibodies against sperm cells. […]

In the dark, the photoreceptors release an inhibitory neurotransmitter that prohibits bipolar neurons from exciting ganglion neurons. Astrocytes play an important role in regulation of blood flow in the brain. Answer: TRUE Oxidizing agents accept electrons from molecules undergoing reduction. […]

Simple diffusion is the net diffusion of a solvent. An EPSP is conducted decrementally to the axon hillock, where voltage-gated Na+ and K+ channels are opened to created an action potential in the first segment of the axon. Answer: TRUE […]

Vital capacity is reduced in pulmonary restrictive disorders. Sympathetic stimulation promotes an overall increase in blood flow resistance. Answer: TRUE During the absorptive state, catabolic reactions are favored over anabolic reactions. Answer: FALSE Ghrelin is postulated to be important as […]

The larger the cross-sectional area of a type of vessel, the higher the blood pressure. Exercise increases the amount of GLUT4 carriers in skeletal muscle. Answer: TRUE Glucagon and cortisol increase lipolysis. Answer: TRUE Cells become more negative during hyperpolarization. […]

At rest, most blood is within the venous system. T cells have receptors for antigens and will bind to free antigens like B cells. Answer: FALSE The platelet release reaction is initiated by platelets binding to exposed collagen in a […]

Retrograde axonal transport may be responsible for movement of herpes virus, rabies virus, and tetanus toxin from nerve terminals to the cell body. Fibers that secrete norepinephrine are called adrenergic fibers. Answer: TRUE The neurons from the hypothalamus secrete chemicals […]

In the Na+/K+ pump, three sodium ions from inside the cell must enter the carrier first. Hypertonic solutions stimulate cellular lysis. Answer: FALSE The main function of the peroxisome is to release energy from food molecules and transform the energy […]

Fast twitch fibers have the greatest resistance to fatigue. In some instances RNA can act as an enzyme. Answer: TRUE The pharynx is a common passageway for the respiratory and digestive systems. Answer: TRUE Melatonin is secreted by the pineal […]

Triglycerides are remade in intestinal epithelial cells before combining with proteins to form chylomicrons. Conduction without decrement means that action potentials transmitted down an axon will not decrease in amplitude. Answer: TRUE Sensory impulses associated with crude touch and pressure […]

Fructose is a ketone. Deletion of the SRY gene would cause male fetuses to develop as females. Answer: TRUE Respiratory acidosis results from hyperventilation. Answer: FALSE The corpus luteum secretes both estradiol and progesterone. Answer: Answer: FALSE Osmosis and simple […]

Gray matter is found only in the cerebral cortex. Communication between the cerebrum and cerebellum is facilitated by the corpus callosum. Answer: FALSE The stomach and small intestines release hormones to help coordinate activities with the autonomic nervous system for […]

Primary lysosomes consist of digestive enzymes and the contents of a food vacuole. The rate at which GnRH is secreted from the hypothalamus determines whether LH or FSH is secreted from the anterior pituitary. Answer: TRUE Corticosteroids are a type […]

Damage to the white matter of the brain would prevent transmission of information between nuclei. The epimysium surrounds the individual muscle cells. Answer: FALSE For a muscle to contract, it must overcome stronger opposing forces. Answer: TRUE GI tract hormones […]