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Physiology Lab Exam #1 CSCC All Possible Questions And Answers Rated A+ New Update Assured Satisfaction
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Describe the events at the axon terminal that cause one neuron to release a neurotransmitter onto another. - The action potential travels down the axon and gets to the axon terminal, which causes calcium to enter the axon terinal, which causes the release of the neurotransmitter by exocytosis int...

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  • August 21, 2024
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Physiology Lab Exam #1 CSCC
Describe the events at the axon terminal that cause one neuron to release a neurotransmitter onto
another. - The action potential travels down the axon and gets to the axon terminal, which causes
calcium to enter the axon terinal, which causes the release of the neurotransmitter by exocytosis into
the synaptic cleft. The post synaptic neuron, dendrite opens voltage gated channels and allow Na+ in and
K+ out.



A hypothyroid individual shows no increase in metabolic rate when injected with TSH. Does this suggest
a primary or secondary hypothyroidism? Prior to the test injection, would this individuals endogenous
TSH levels be low or high? - Primary hypothyroidism. They would be high.



"Pulse deficit" describes a difference between pulse rate assessed by palpating a radial pulse and heart
rate assessed by auscultation (listening) or ECG. What could account for pulse deficit? - Pulse
deficits can occur when there are circulatory problems, atrial fibrillation, or valvular disturbances.



A difference between the palpated heart rate and the heart rate calculated by auscultation is termed a -
Pulse deficit



A hypothyroid individual responds to a TSH injection with an increase in metabolic rate. Does this
suggest a primary or secondary hypothyroidism? Prior to the test injection, would this individuals
endogenous TSH levels be low or high? - Secondary hypothyroidism. They would be low.

A red blood cell is surrounded by a solution containing a higher concentration of solutes than found
inside the cell. Cell membranes act as selectively permeable membranes. What will happen to this cell? -
Water will leave the cell and the cell will crenate



acetyl inhibitor - more acetylocholine/more muscle contraction



Administration of what hormone could be vaulable in treating that condition - thyroid hormone



After some neurotransmitter is released, what, in addition to diffusion, prevents it from accumulating in
the space between cells? - Enzymes break apart the neurotransmitter or reuptake

, Although the cold caloric test, in which cold water is introduced into the ear, can be used to assess the
function of the vestibular portion of the vestibulocochlear nerve, what is that test more commonly used
for? - Assess level of consciousness



Although we typically measure respiratory rate as a vital sign, what respiratory system parameter might
be more useful in assessing an individual's health? - Pulse oximeter, tidal volume, ABG's



An agonist of what hypothalamic hormone might be valuable in treating the above condition? -
Dopamine



An individual is asked to smile broadly. It is observed that the left corner of the mouth cannot be
elevated in a normal fashion. Which cranial nerve is involved in this facial control issue, and is the lesion
in that nerve, or within the central nervous system? - Cranial Nerve VII (Facial), Central Nervous
System



An individual with a low metabolic rate improves with the administration of thyroid hormones, but
shows no improvement upon injection of TSH. This person's low metabolic rate originates at what gland?
- They thyroid is likely where it originates. The thyroid is not responding to TSH, so it is not
secreting thyroid hormone. So the metabolic rate does not improve unless the person is injected with
they thyroid hormone.



Area with only thick filaments - H zone



Area with only thin filaments - I band



As we increase the intensity of electrical stimulation of the muscle in our computer simulation, we are
mimicking the way the nervous system increases the - number of motor units activated.



At the axon terminal, there are often receptors for the neurotransmitter secreted by that neuron. What
is the function of such receptors? - The function is for reuptake, so the neurotransmitter can be
used again.



Beta blocker - decrease heart rate

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