Physiology V01 - Introduction to Human Physiology » Fall 2021 » Lecture Quiz 8

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Question #1
Plasma comprises 45% of the blood and the formed elements make up the remaining 55%.
A.   FALSE
B.   TRUE
Question #2
Which of the following serve as buffers and help to control blood osmolarity?
A.   enzymes and globulins
B.   hormones and enzymes
C.   albumins and electrolytes
Question #3
Neutrophils and macrophages are phagocytic cells that can leave the blood and move into the surrounding tissues.
A.   FALSE
B.   TRUE
Question #4
Which of the following is not true of erythrocytes?
A.   transports oxygen and carbon dioxide
B.   mature cells do not have nuclei
C.   males have about 5.5 million/mm3
D.   they are biconcave discs
E.   hypoxia → ↑ spleen → erythropoietin → ↑ red marrow → ↑ production of erythrocytes
Question #5
Platelets attach to collagen fibers from damaged epithelial cells.
A.   FALSE
B.   TRUE
Question #6
What causes the plateau phase of a cardiac muscle action potential?
A.   influx of Na+ and K+
B.   influx of Ca2+ and K+ moving out
C.   Ca2+ moving out and influx of K+
Question #7
According to Frank-Starling’s law, the strength of contraction is proportional to the amount of stretching of the myocardium.
A.   TRUE
B.   FALSE
Question #8
Which step of a nodal cell action potential is incorrect?
A.   at -40 mv, voltage-regulated Na+ gates open and additional Na+ enters the cell
B.   at about +5 - +15 mv, voltage-regulated K+ gates open and K+ diffuses out causing repolarization
C.   at -60 mv, pacemaker channels allow Na+ to diffuse in causing the pacemaker potential
D.   at -60 mv, voltage-regulated K+ gates close
E.   Na+ diffuse through the pacemaker channels causing another pacemaker potential
Question #9
Impulses from atrial muscles reach the AV-node and are slowed down due to the slower conduction velocity of its cells which are smaller in diameter and have fewer gap junctions.
A.   TRUE
B.   FALSE
Question #10
The end-diastolic volume (EDV) is directly proportional to what factors?
A.   filling time and venous return
B.   afterload and contractility
C.   preload and contractility
Question #11
How do neutrophils to kill microbes?
A.   degranulation, production of antibodies, and present antigens to helper T cells
B.   phagocytosis, production of antibodies, and present antigens to helper T cells
C.   phagocytosis, degranulation, and formation of extracellular traps
Question #12
Which of the following would stimulate the cardiac control center in the medulla oblongata?
A.   ↑ aortic and carotid bodies, ↑ hypothalamus, and ↓ baroreceptors
B.   ADH, ↑ venous return, and ↓ baroreceptors
C.   ADH, ↑ venous return, and ↑ hypothalamus

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