Question: Question 1. Increased peripheral edema could be caused by: a. blocked lymph vessels b. decreased …

Question 1. Increased peripheral edema could be caused by: a.
blocked lymph vessels b. decreased capillary blood pressure c.
increased concentration of albumin in the blood d. slowed heart
rate

Question 2. The pulse pressure of a healthy student is most
likely to be: a. 5 mm Hg b. 30 mm Hg c. 95 mm Hg d. 120 mm Hg

Question 3. beta-blockers inhibit the activity of
beta-adrenergic receptors and change the function of the heart by:
a. increasing heart rate and increasing contractility b. increasing
heart rate and decreasing contractility c. decreasing heart rate
and increasing contractility d. decreasing heart rate and
decreasing contractility

Question 4. In cardiac pacemaker cells, the L-type calcium
channels: a. open during diastole b. close when the membrane
potential rises above threshold c. are located in the cell membrane
d. pump Ca2+ ions into the sarcoplasmic reticulum

Question 5. Dr. Campbell used an elliptical trainer for 40
minutes at the gym. Although the workload remained constant, Dr.
Campbell’s heart-rate rose to 150 beats per minute during the first
5 minutes, stayed at that level for the next 25 minutes and then
started to rise. It was 180 beats per minute at the end of the
exercise period. What was the time interval between QRS complexes
when Dr. Campbell’s heart rate was 180 beats per minute? a. 3.3 ms
b. 33 ms c. 333 ms d. 3333 ms

Question 6. In the question 5 above, Dr. Campbell’s heart rate
is most likely to have risen during the last 10 minutes of exercise
because his: a. lungs were becoming congested b. atrial cells were
fatigued c. extracellular Ca2+ concentration had increased d.
hematocrit increased due to sweating

Question 7. A Physiology student is sitting still in a cold
igloo. After 30 minutes, she stands up, walks slowly around the
igloo, and suddenly starts to shiver. The student preserved their
core temperature while they were sitting by: a. depressing their
Frank-Starling mechanism b. decreasing the extracellular Ca2+
concentration c. relaxing smooth muscles in their peripheral
circulation d. increasing the resistance of arterioles in their
arms and legs

Question 8. In the question 7 above, the student started to
shiver soon after walking because: a. their atria started to
fibrillate b. their ventricles started to fibrillate c. blood moved
to the periphery, became cold, and chilled the core when it
returned to the chest d. the ATP concentration in their skeletal
muscles had dropped to zero

Please use the following scenario for answering the questions 9
and 10. A newly discovered drug binds to myosin molecules in
cardiac muscle (and nowhere else) and increases the probability
that myosin molecules in ventricular cells will bind to actin
filaments when the intracellular Ca2+ concentration rises. The drug
is being tested as a potential therapy for patients with heart
failure.

Question 9. This drug might help people who have low cardiac
output by: a. increasing peripheral resistance b. increasing the
force developed by ventricular cells c. increasing the isovolumic
contraction time d. increasing heart rate

Question 10. The increased binding of cardiac myosin molecules
to actin might prevent the drug from being a useful treatment by:
a. slowing ventricular relaxation b. decreasing the duration of
systole c. decreasing resistance of capillaries c. decreasing
resistance of capillaries d. slowing heart rate