Physiology Lab Exam #1 CSCC All Possible Questions And Answers Rated A+ New Update Assured Satisfaction

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 reuptakeAlthough 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 rateDeficit in proprioceptive function - can not sense position of limbs in space. Deficit in vestibular system - positive Romberg Test. Feels dizzy. CAN tell position of digits in space. Define motor unit - A motor neuron and the muscle fibers in innervates Define osmolarity - The molarity of a solutions times the number of ions (concentration) Describe a test to assess the function of the olfactory nerve. Why are we not doing that in our lab? - Occlude one nostril and present an odor to the person. We are not doing it for sanitary reasons.