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1)
figure 10-1 skeletal muscle fiber
what is released from the structure labeled "9"?
a) sarcoplasm
b) acetylcholine
c) protein
d) calcium ions
e) acetylcholinesterase
2) a stimulus that changes a postsynaptic neuron's membrane from resting potential to
-85 mv is:
a) an excitatory stimulus
b) a depolarizing stimulus
c) a temporal stimulus
d) a saltatory stimulus
e) an inhibitory stimulus
3) the root of a tooth is covered by
a) enamel.
b) cementum.
c) dentin.
d) pulp.
e) the root canal.
4) a labeled line is
a) a translation of complex sensory information.
b) a link between a receptor and a cortical neuron.
c) a reduction in sensitivity.
d) a stimulation that produces action potentials.
e) an adjustment for sensitivity adaptation.
5) as an astronaut is lifted into earth's orbit, what is the first change to take place in
response to the drop in cabin pressure?
a) increased hematocrit
b) renal hypoxia
c) increased alveolar ventilation rate
d) decreased alveolar po2
e) decreased hemoglobin saturation
6) which of the following chemicals is not present in bone?
a) calcium phosphate
b) collagen fibers
c) calcium carbonate
d) chondroitin sulfate
e) hydroxyapatite
7) a gland formed by cells arranged in a blind pocket with a single unbranched duct
would be called
a) simple tubular.
b) simple alveolar.
c) compound tubular.
d) compound alveolar.
e) tubuloalveolar.
8) a ray of light entering the eye will encounter these structures in which order?
a) conjunctiva cornea aqueous humor lens vitreous body retina choroid
b) vitreous body retina choroids aqueous humor lens conjunctiva cornea
c) cornea aqueous humor vitreous body lens conjunctiva choroids retina
d) conjunctiva cornea lens aqueous humor vitreous body retina choroid
e) cornea aqueous humor conjunctiva lens vitreous body retina choroid
9) removal of the amino group from amino acids in the first step of their catabolism
requires a coenzyme derived from vitamin ________.
a) a
b) c
c) b12
d) b6
e) b9
10) the vitamin whose deficiency causes beriberi is
a) thiamine.
b) riboflavin.
c) niacin.
d) folic acid (folate).
e) cobalamin.
11) the ________ tract provides subconscious regulation of upper limb muscle tone and
movement and is part of the ________ pathway.
a) tectospinal; lateral
b) rubrospinal; lateral
c) reticulospinal; medial
d) vestibulospinal; lateral
e) corticobulbar; medial
12) the laryngeal cartilage not composed of hyaline cartilage is the
a) arytenoid.
b) corniculate.
c) cricoid.
d) epiglottis.
e) thyroid.
13) each of the following is a function of the integumentary system, except
a) protection of underlying tissue.
b) excretion of salts and wastes.
c) maintenance of body temperature.
d) synthesis of vitamin c.
e) provision of sensation.
14) the villi are most developed in the
a) stomach.
b) duodenum.
c) jejunum.
d) gallbladder.
e) cecum.
15) which of the following is a function of the blood?
a) transport of nutrients and wastes
b) transport of body heat
c) transport of gases
d) defense against toxins and pathogens
e) all of the answers are correct.
16) the respiratory mucosa consists of
a) epithelium and underlying layer of areolar tissue.
b) dense irregular connective.
c) stratified squamous cells.
d) fibrocartilage.
e) all of the answers are correct.
