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NAVIGATION
  Physio Lab 2016 Practice Questions
 
Midterm exam practice Questions
MEC.CUNY
Physiology lab Fall 2016-10-22
1...Define action potential 
2. Calculate Mean , range and standard deviation of sample 9,3,5,3,,sample size n=4
3. Define osmosis and osmotic pressure…
4. What do you understand by the term standard deviation 
5. Explain positive and negative feedback and give one example of both
6. Define null hypothesis and population
7. Define median .
8. what is effect of hypotonic ,hypertonic and isotonic fluid on Red blood cells
9. Define Reflex
10.
True or false
Diffusion is movement of solvent from high to low
11.
True or false
Osmosis is movement of solute from low to high


12. Null hypothesis is a statement of
a. no difference
b. difference
c. equal
d. statistical analyses


13. population is defined as group in
a. space and time
b. time and place
c. place and space


14. other name for a receptor is
a .sensor
b.detector
c evaluator


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Multiple Choice

1. (1) Which of the following is NOT a touch or pressure cutaneous receptor?
Golgi Corpuscle
Pacinian Corpuscle
Merkel's Disk
Meissner's Corpuscle
2. (1) Pupil diameter would be increased by
contraction of the circular muscles.
contraction of the ciliary body.
contraction of the superior rectus muscle.
contraction of the radial muscles.
3. (1) Shivering in response to a cold draft is an example of

a homeostatic mechanism.

negative feedback.

a physiological reflex.

thermoregulation.

All of the choices are correct.
4. (1) If the amount of sodium in the blood decreases, what would a negative feedback control mechanism be expected to do?
Decrease the amount of sodium in the blood.
Increase the amount of sodium in the blood.
Leave the amount of sodium unchanged.
Change the set point for sodium.
Inhibit the ingestion of more sodium.
5. (1) The hormone insulin enhances the transport of glucose into body cells. Its secretion is controlled by a negative feedback system between the concentration of glucose in the blood and the cells that secrete insulin. Which of the following statements is most likely to be correct?

A decrease in blood glucose concentration will stimulate insulin secretion, which will in turn lower the blood glucose concentration still further.

An increase in blood glucose concentration will stimulate insulin secretion, which will in turn lower the blood glucose concentration.

A decrease in blood glucose concentration will stimulate insulin secretion, which will in turn increase the blood glucose concentration.

An increase in blood glucose concentration will stimulate insulin secretion, which will in turn increase the blood glucose concentration still further.
6. (1) During concentric isotonic contraction of a skeletal-muscle fiber, which of these occurs?
sarcomeres lengthen
A bands shorten
I bands shorten
A bands lengthen
thin filaments shorten
7. (1) In skeletal muscle cells, calcium initiates contraction by binding to:
tropomyosin.
actin.
troponin.
myosin.
the thick filament.
8. (1) Which best describes "rigor mortis?"
Lack of ATP following death causes cross-bridges to remain tightly bound to actin.
Lack of ATP following death causes calcium to remain in the cytosol, continuously stimulating cross-bridge cycling.
Repeated, high-frequency action potentials to a skeletal muscle fiber causes sustained contraction following death.
Following death, calcium-activated proteases degrade all proteins in skeletal muscle fibers, making muscles limp.
Build-up of K+ in T-tubules causes constant, tetanic contractions of skeletal muscles that last for about 12 hours following death.
9. (1) Rigor mortis is caused by:
buildup of lactic acid.
lack of Ca2+.
depletion of glycogen.
lack of ATP.
deficient acetylcholine receptors.
10. (1) Myasthenia gravis is a collection of muscle disorders that cause muscle fatigue and weakness.  What is the major mechanism?
overproduction of acetylcholinesterase
autoimmune destruction of nicotinic acetylcholine receptors
demyelination of axons in motor pathways
autoimmune destruction of L-type Ca2+ channels.
a tumor that overproduces acetylcholine
11. (1) Sustained contraction and tension in a skeletal muscle is called tetanus.
True
False
12. (1) The pacemaker of the heart is normally what structure?
sinoatrial node
atrioventricular node
mitral valve
bundle of His
left ventricle
13. (1) The frequency of action potentials generated by the SA node is:
increased by parasympathetic stimulation.
decreased by sympathetic stimulation.
increased by acetylcholine.
increased by epinephrine.
increased by an increase in blood pressure.
14. (1) Norepinephrine and vasopressin are used therapeutically to

decrease glomerular filtration rates.

decrease blood pressure.

increase blood pressure.

stabilize respiration rates.

enhance CO2 and O2 exchange between alveoli and alveolar capillaries.
15. (1) Fever:
is a reduction in the body temperature caused by sweating and shivering.
is an adaptive response that raises the set point temperature of the body to help fight an infection.
is a maladaptive response induced by bacterial toxins, by which bacteria create conditions more favorable for their own growth.
is a warming of the skin, leading to reduction of the core body temperature and hypothermia.

is an adaptive response in which sweat glands dilate and secrete extra fluid, into which bacterial toxins are extruded.




 
  
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