BMS 302 EXAM 3 STUDY GUIDE UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS

BMS 302 EXAM 3 STUDY GUIDE UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS

Question:
1. What is the source of Ca in skeletal muscle?
Answer:
sarcoplasmic reticulum

Question:
2. Source of calcium in cardiac muscle?
Answer:
sarcoplasmic reticulum and extracellular sources

Question:
3. Means of excitation for skeletal muscle is?
Answer:
Nervous system

Question:
4. Means of excitation for cardiac muscle is?
Answer:
Inherent contractions initiated by pacemaker cells

Question:
5. Innervation of skeletal muscle is through
Answer:
Somatic Nervous system

Question:
6. Innervation of cardiac muscle is through
Answer:
Autonomic Nervous system

Question:
7. The length of refraction in skeletal muscle is?
Answer:
2-3 msec

Question:
8. Length of refraction in cardiac muscle is?
Answer:
200 msec or more

Question:
9. What are the phases of the cardiac muscle?

,Answer:
Non refractory Absolute refractory Repolarization

Question:
10. Absolute refractory
Answer:
The inability of cardiac muscle to be tetanized

Question:
11. An extra systole can be initiated during
Answer:
Repolarization

Question:
12. Membrane depolarization occurs during
Answer:
Non refractory

Question:
13. Membrane repolarization occurs during
Answer:
Repolarization

Question:
14. Curve measured in grams
Answer:
Mechanical

Question:
15. Curve measured in mV
Answer:
Electrical

Question:
16. Which ion is responsible for the long plateau phase of the ventricular muscle action potential
Answer:
Ca

Question:
17. Long plateau phase of the fast response of cardiac muscle
Answer:
-is responsible for the long refractory period seen in cardiac muscle
-prevents tetanizing
-allows heart to serve as pump bc ventricles have time to fill before another contraction induced
-keeps cardiac muscle in depolarized state so another contraction cannot be initiated until heart has had
time to contract/refill

, Question:
18. During the cardiac cycle an extra systole can be induced by electrical stimulation during?
Answer:
Relative refractory period

Question:
19. T/F 2 systems control cardiac function are autoregulation via einthoven's law and nervous system
control via somatic nerves
Answer:
T

Question:
20. Starling's law
Answer:
-is the result of the length-force relationship also observed in skeletal muscle
-states that within physiological limits the heart pumps out the blood that returns to it within each cycle
-is observed in the absence of nervous/hormonal control
-can be described as autoregulation
-is the result of cardiac fiber length being proportional to end diastolic volume
-is demonstrated by an increased force of contraction with increased stretch of cardiac muscel

Question:
21. Starling's law of the heart holds that the ______, the greater force of contraction
Answer:
greater the venous return greater the end diastolic volume greater the length of myocardial fibers

Question:
22. SA node is innervated by?
Answer:
Parasympathetic and sympathetic nervous system

Question:
23. AV node is innervated by?
Answer:
Parasympathetic and sympathetic nervous system

Question:
24. Atria is innervated by?
Answer:
Both parasympathetic and sympathetic nervous system

Question:
25. Ventricles are innervated by?
Answer:
Sympathetic