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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.
Over-secretion of growth hormone in children causes
A.acromegaly.
B.pituitary cachexia.
C.gigantism.
D.myxedema.
Which regulatory molecule cannot enter its target cell?
A. epinephrine
B. acetylcholine
C. nitric oxide
D. epinephrine AND acetylcholine
A cranial nerve with only sensory fibers is the
A. hypoglossal nerve.
B. vestibulocochlear nerve.
C. vagus nerve.
D. trigeminal nerve.
The model that describes how an enzyme can adjust its shape to fit the shape of the
substrate is the
A. lock-and-key model.
B. enzyme-substrate model.
C. induced-fit model.
D. conformational model.
Glucose transported via the GLUT carrier is characterized as
A. active transport.
B. passive transport.
C. co-transport.
D. receptor-mediated endocytosis.
Which type of muscle has the greatest capillary density?
A.skeletal
B.smooth
C.cardiac
The secretory phase of the endometrium occurs when the ovary is in the
A.follicular phase.
B.luteal phase.
C.menstrual phase.
D.ovulatory phase.
As the magnitude of a generator potential increases the _____________ of action
potentials in the sensory neuron increases.
A.adaptation
B.frequency
C.amplitude
D.sensitivity
The brain produces lipid neurotransmitters called
A. endocannabinoids.
B. endorphins.
C. enkephalins.
D. nitric oxide.
Which of the following is NOT a function of neuroglia?
A.bind neurons together
B.help nourish neurons
C.conduct impulses to effectors
D.modify the extracellular environment of neurons
Where is oxytocin produced?
A.hypothalamus
B.pineal gland
C.anterior pituitary gland
D.posterior pituitary gland
Damage to upper motor neurons would be indicated by all of the following except
A.spastic paralysis.
B.chorea.
C.intention tremor.
D.flaccid paralysis.
Slow waves of the intestine are conducted through what type of cells?
A.gastric cells
B.microflora cells
C.SXR Cells
D.Cajal cells
The Golgi apparatus is involved in
A. intracellular calcium storage.
B. adding carbohydrates to proteins.
C. degradation of organelles.
D. mitotic chromosomal movement.
Which of the following is NOT produced by the liver?
A.hydroxylated steroid hormones
B.uric acid
C.digestive enzymes
D.bilirubin
Which of the following is NOT an example of positive feedback?
A.LH surge
B.labor contractions
C.blood glucose maintenance
D.blood clotting
A hypothesis is scientific if it
A.supports other hypotheses.
B.can be tested.
C.refutes other hypotheses.
D.uses observational analyses.
Hypertension may cause
A. increased afterload.
B. hypertrophy of the ventricles and valve defects.
C. broken capillaries in tissues and organs.
D. All apply.
This group of organic compounds acts as surfactants:
A.carbohydrates
B.phospholipids
C.nucleic acids
D.prostaglandins
Once a B lymphocyte has been activated to an antigen, it travels to a secondary
lymphoid organ and forms a ______ where cloning occurs.
A.MHC molecule
B.FAS
C.CD4
D.germinal center
Alpha-1-adrenergic receptors are mediated by
A.cAMP.
B.Ca2+.
C.K+.
D.Na+.
Relaxation of cerebral blood vessels would be stimulated by excessive ________
activity.
A. nitric oxide
B. acetylcholine
C. norepinephrine
D. glutamate
During reduction, a molecule or atom
A.gains protons or gains electrons.
B.loses protons or gains electrons.
C.gains protons or loses electrons.
D.loses protons or loses electrons.
The rate at which a chemical reaction can be increased is by either ______________ the
temperature or ______________ the activation energy.
A.increasing, increasing
B.increasing, decreasing
C.decreasing, decreasing
D.decreasing, increasing
The spooling of DNA around histones creates particles called
A. nucleoli.
B. proteosomes.
C. nucleosomes.
D. euchromatin.
Normal alveolar PCO2 is
A.40 mm Hg.
B.46 mm Hg.
C.100 mm Hg.
D.105 mm Hg.
The normal effect of -endorphin can be blocked by
A. curare.
B. naloxone.
C. muscarine.
D. nicotine
Muscles which move a limb away the midline of the body are termed as
A. abductor muscles.
B. adductor muscles.
C. extensor muscles.
D. flexor muscles.
The membrane of resting nerve cells is more permeable to ____________ ions than
____________ ions.
A. sodium, potassium
B. calcium, potassium
C. potassium, sodium
D. chloride, potassium
A continual recycling of electrical waves through the myocardium is called
A.circus rhythm.
B.atrial flutter.
C.asystole.
D.SA node block.
Enterogasterone will _____ gastric function.
A.stimulate
B.inhibit
C.have no effect on
Blocking ____________ channels would prevent neuron depolarization.
A. K+
B. Cl-
C. Na+
D. Mg2+
