1) opening of sodium channels in the axon membrane causes
a) depolarization.
b) repolarization.
c) hyperpolarization.
d) increased negative charge inside the membrane.
e) inhibition.
2)
figure 15-1 spinothalamic tracts
identify the structure labeled “5”
a) thalamus
b) cerebral cortex
c) primary motor cortex
d) primary sensory cortex
e) autonomic ganglion
3) if the connection between the sa node and av node becomes blocked,
a) the ventricles will beat faster.
b) the ventricles will beat more slowly.
c) the ventricular beat will remain unchanged.
d) cardiac output will increase.
e) the atria will contract more forcefully.
4) in an isotonic contraction,
a) muscle tension exceeds the load and the muscle lifts the load.
b) tension rises and falls but the muscle length is constant.
c) the peak tension is less than the load.
d) many twitches always fuse into one.
e) postural muscles stabilize the vertebrae.
5) while standing erect, the direction of caudal is
a) toward the head.
b) toward the heel.
c) lateral to the trunk.
d) medial to the sides.
e) posterior to the head.
6) the nail body covers the
a) nail root.
b) nail bed.
c) lunula.
d) free edge.
e) hyponychium.
7) the right pulmonary veins carry ________ blood to the ________ .
a) deoxygenated; left atrium
b) oxygenated; right lung
c) deoxygenated; superior vena cava
d) deoxygenated; right atrium
e) oxygenated; left atrium
8) the term ________ means each enzyme catalyzes only one type of reaction.
a) saturation
b) specificity
c) inertia
d) activation
e) monoreactive
9) lymphocytes provide an adaptive or specific defense known as the
a) phagocytic response.
b) adaptive defense.
c) immune response.
d) lymphocytic response.
e) inflammation of tissues.
10) which of the following is true about rhodopsin?
a) called visual purple
b) is bleached during photoreception
c) is the visual pigment in rods
d) consists of opsin + retinal
e) all of the answers are correct.
11) which of the following muscles move the testes toward the body?
a) the cremaster
b) the tunica muscularis
c) the biceps brachii
d) the dartos
e) both the cremaster and the dartos muscles
12)
figure 12-2 the nerve action potential
which area of the graph shows when membrane potential approaches the potassium
equilibrium potential?
a) 1
b) 2
c) 3
d) 4
13) which digestive juice contains enzymes that breakdown carbohydrates, lipids, and
proteins?
a) intestinal juice
b) pancreatic juice
c) bile
d) gastric juice
e) saliva
14) which of the following hormones increases and prolongs effects of the sympathetic
nervous system?
a) cortisol
b) parathyroid hormone
c) insulin
d) growth hormone
e) epinephrine
15) fine hairs (like “velvet”) that lack pigment and cover much of the body surface are
called ________.
16) the portions of an antigen to which antibodies bind are the ________.
17) communication between cells is key to organism-level regulation of the internal
environment to maintain health, that is, nearly constant internal conditions
(homeostasis). outline and compare the intercellular communication pathways that
function to provide homeostasis.
18) the protein that regulates muscle contraction by controlling the availability of active
sites on actin is called ________.
19) transfer of mrna from the nucleus to the cytosol occurs through ________.
20) muscles on the posterior of the antebrachium ________ the wrist and fingers.