14. T F Work is done in an isometric contraction. 15. T F The first valve that b
ID: 3481755 • Letter: 1
Question
14. T F Work is done in an isometric contraction.
15. T F The first valve that blood encounters when returning to the heart from the lungs is the left semilunar valve.
16. T F Tropomyosin is the muscle protein with the highest affinity for calcium
17. T F Vagal stimulation increases the rate of spontaneous depolarization in pacemaker cells
18. T F Standing suddenly will stimulate baroreceptors and reflexively increase HR.
19. T F Local autoregulation of blood flow in the lungs is opposite that of the brain
20. T F The carrier for oxygen in some lower vertebrates is not based on iron but copper.
Explanation / Answer
14. True.
15. False.
Semilunar valves occur in the base of great arteries, systemic aorta and pulmonary aorta and blood returns to the heart from lungs by pulmonary veins.
16. False.
High affinity calcium binding protien (HACBP) is the muscle protien with highest affinity for calcium
17. False.
Vagal stimulation decreases activity of pacemaker cells by increasing flow of K+ ions and decreasing inward flow of Na+ and rate of depolarization of pacemaker cells is decreased.
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