BIO 612 EXAM 2 QUESTIONS AND ANSWERS
100% VERIFIED
Suppose that the electrochemical force for an anion (X) acts to move the anion out of the
cell. If a neurotransmitter binds to its receptor and opens channels for X on the
postsynaptic cell, then the response would: - ANSWER an EPSP
Which of the following contains only sensory neurons? - ANSWER Dorsal Root
At the neuromuscular junction, which step happens LAST when an action potential
reaches the axon terminal? - ANSWER Acetylcholine binds with receptors on the motor
end plate
With pre-marathon training, a runner's body adjusts by increasing the amount of
acetylcholinesterase. What would be the physiological effect on skeletal muscle fibers?
- ANSWER It would lead to a faster speed of relaxation
When a skeletal muscle is stimulated to contract, calcium binds to: - ANSWER Troponin
Which of the following is a role for ATP in skeletal muscle contraction? - ANSWER To
allow myosin to detach from actin
Creatine phosphate: - ANSWER the muscle cell with a quick energy source
A contraction that generates force and moves a load is known as _________, whereas
one that generates force without movement is known as _________. - ANSWER isotonic;
isometric
In a twitch summation: - ANSWER the muscle fiber is stimulated again before the
filaments have completely returned to their resting position & stronger muscle
contraction occur but stronger action potentials do not occur.
One of the major differences among skeletal muscle fiber types is their resistance to
fatigue. The fibers with the most endurance rely on _________ for energy. - ANSWER
Oxydative phosphorylation
Chronic endurance training would result in all of the following EXCEPT: - ANSWER
interconversion of fast-twitch fibers to slow-twitch fibers
Why are interneurons needed as part of the withdrawal reflex? - ANSWER It allows for
the flexor to contract and the extensor to relax in response to the same afferent info
Parasympathetic ganglia are generally located: - ANSWER next to or within the organs
innervated
Which of the following is NOT true about the sympathetic nervous system? - ANSWER it
, emerges from the cranial and sacral regions of the CNS
Which type of autonomic receptor is found in the synapse of the parasympathetic
postganglionic fiber with the effect organ? - ANSWER muscarinic
A person stuffers from a chronically dry mouth, What type of drug would be the BEST to
treat this disorder - ANSWER Parasympathetic agonist
Which of the following have gap junctions? - ANSWER single-unit smooth muscle
Which of the following is NOT a hormone released from the anterior pituitary? - ANSWER
Prolactin inhibiting hormone
Which of the following is NOT a tropic hormone? - ANSWER prolactin
In follicles, __________ is the protein from which the thyroid hormones are made and on
which the thyroid hormones can be stored. - ANSWER thyroglobulin
Steroid hormones are secreted by: - ANSWER adrenal cortex
Which of the following is NOT one of the growth-supporting functions of growth
hormone? - ANSWER Increased glucose uptake by muscles
What is the primary hormone mediating the body's stress response? - ANSWER cortisol
A person has a tumor causing an excess in TRH secretion. Which of the following
correctly describes the change in plasma levels of hormones? - ANSWER Increased
TRH, increased TSH, and increased thyroxine
Acromegaly is associated with what endocrine malfunction? - ANSWER Increase in
growth hormone in adults
Place these structures in order that blood returning to the heart from the body would
pass through them: - ANSWER right atrium right ventricle pulmonary artery pulmonary
vein left atrium left ventricle
Which of the following statements about action potentials in the heart is NOT true? -
ANSWER The spontaneous depolarization to threshold in cardiac pacemaker cells is
due in large part to K+ channels opening
Which of the following is NOT a function for calcium in the heart? - ANSWER To stimulate
cardiac contractile cells to relax
Which of the following ECG waves represents ventricular repolarization? - ANSWER T
wave
100% VERIFIED
Suppose that the electrochemical force for an anion (X) acts to move the anion out of the
cell. If a neurotransmitter binds to its receptor and opens channels for X on the
postsynaptic cell, then the response would: - ANSWER an EPSP
Which of the following contains only sensory neurons? - ANSWER Dorsal Root
At the neuromuscular junction, which step happens LAST when an action potential
reaches the axon terminal? - ANSWER Acetylcholine binds with receptors on the motor
end plate
With pre-marathon training, a runner's body adjusts by increasing the amount of
acetylcholinesterase. What would be the physiological effect on skeletal muscle fibers?
- ANSWER It would lead to a faster speed of relaxation
When a skeletal muscle is stimulated to contract, calcium binds to: - ANSWER Troponin
Which of the following is a role for ATP in skeletal muscle contraction? - ANSWER To
allow myosin to detach from actin
Creatine phosphate: - ANSWER the muscle cell with a quick energy source
A contraction that generates force and moves a load is known as _________, whereas
one that generates force without movement is known as _________. - ANSWER isotonic;
isometric
In a twitch summation: - ANSWER the muscle fiber is stimulated again before the
filaments have completely returned to their resting position & stronger muscle
contraction occur but stronger action potentials do not occur.
One of the major differences among skeletal muscle fiber types is their resistance to
fatigue. The fibers with the most endurance rely on _________ for energy. - ANSWER
Oxydative phosphorylation
Chronic endurance training would result in all of the following EXCEPT: - ANSWER
interconversion of fast-twitch fibers to slow-twitch fibers
Why are interneurons needed as part of the withdrawal reflex? - ANSWER It allows for
the flexor to contract and the extensor to relax in response to the same afferent info
Parasympathetic ganglia are generally located: - ANSWER next to or within the organs
innervated
Which of the following is NOT true about the sympathetic nervous system? - ANSWER it
, emerges from the cranial and sacral regions of the CNS
Which type of autonomic receptor is found in the synapse of the parasympathetic
postganglionic fiber with the effect organ? - ANSWER muscarinic
A person stuffers from a chronically dry mouth, What type of drug would be the BEST to
treat this disorder - ANSWER Parasympathetic agonist
Which of the following have gap junctions? - ANSWER single-unit smooth muscle
Which of the following is NOT a hormone released from the anterior pituitary? - ANSWER
Prolactin inhibiting hormone
Which of the following is NOT a tropic hormone? - ANSWER prolactin
In follicles, __________ is the protein from which the thyroid hormones are made and on
which the thyroid hormones can be stored. - ANSWER thyroglobulin
Steroid hormones are secreted by: - ANSWER adrenal cortex
Which of the following is NOT one of the growth-supporting functions of growth
hormone? - ANSWER Increased glucose uptake by muscles
What is the primary hormone mediating the body's stress response? - ANSWER cortisol
A person has a tumor causing an excess in TRH secretion. Which of the following
correctly describes the change in plasma levels of hormones? - ANSWER Increased
TRH, increased TSH, and increased thyroxine
Acromegaly is associated with what endocrine malfunction? - ANSWER Increase in
growth hormone in adults
Place these structures in order that blood returning to the heart from the body would
pass through them: - ANSWER right atrium right ventricle pulmonary artery pulmonary
vein left atrium left ventricle
Which of the following statements about action potentials in the heart is NOT true? -
ANSWER The spontaneous depolarization to threshold in cardiac pacemaker cells is
due in large part to K+ channels opening
Which of the following is NOT a function for calcium in the heart? - ANSWER To stimulate
cardiac contractile cells to relax
Which of the following ECG waves represents ventricular repolarization? - ANSWER T
wave
