112. Describe the circulatory events that are likely during vigorous exercise?
capillaries of the active muscles will be engorged w/ blood, skin will be cold & clammy, blood will be rapidly diverted to the digestive organs
Vascular shock –
poor circulation resulting from extreme vasodilation
65. Explain autorhythmicity in cardiac muscle cells.
Autorhythmic cells: Initiate action potentials; Have unstable resting potentials called pacemaker potentials; Use calcium influx (rather than sodium) for rising phase of the action potential
25. When the heart is beating at a rate of 75 times per minute, the duration of one cardiac cycle is _____ second(s).
60
52. The enlarged coronary vessel outside the heart that empties blood into the right atrium is the ________.
vena cava
101. What is the site that is the major determinant of peripheral resistance.
large arteries close to the small diameter arterioles
103. List the chemicals that control blood pressure?
ADH, Atrial natriuretic peptide, nitric oxide
9. Which valve prevents backflow into the left ventricle.
aortic semilunar valve
114. Describe the structure and function of veins?
venules join to form veins, usually have 3 distinct tunics, their walls are always thinner & their lumens larger than those of corresponding arteries
174. List the functions of the spleen
Site of lymphocyte proliferation; Immune surveillance and response; Cleanses the blood
