9-13. please.. 9) Which of the following is TRUE regarding contractions of the h
ID: 277765 • Letter: 9
Question
9-13. please..
9) Which of the following is TRUE regarding contractions of the heart? A) The ventricles contract first, followed by the atria. B) The contractions do not occur in any specific or precise sequence each time. C) Cardiac muscle tissue contracts under neural stimulation. D) The rate of cardiac contractions are established by the conducting fibers E) Cardiac contractions are coordinated by specialized conducting cells that distribute the stimulus to cardiac muscle 10) During the late stages of ventricular diastole, the A) atria are contracting B) AV valves are closed C) ventricles are contracting D) pressure in the ventricles does not change E) ventricles are filling 1 1) Vasoconstriction and vasodilation occur due to which vessel layer? A) endothelium B ) intima C) media D) epithelium E) adventitia 12) Which of the following is TRUE of an artery? A) The vessel walls are relatively thin. B) Blood flow is the slowest of all classes of vessels C) The histological structure permits a two-way exchange of substances between the blood and body cells D) The lumen is relatively smaller than that of a corresponding vein. E) The adventitia is frequently absent. ??13) In the lymphatic system, most invading pathogens are first encountered by A) primary lymphatic structures B) tertiary lymphatic structures C) blood D) secondary lymphatic structures E) the liver L Cmnare d to hlaad canillaries, lymphatic capillariesExplanation / Answer
Answer:
9.
Atria contracts first followed by ventricles.Contraction and relaxation of heart is occur in a systematic manner.Cardiac Muscles do not contract under neural stimulation.Rate of cardiac mucles are established by nodal cell.
Cardiac contraction are coordinated by specialized conducting cells that distribute the stimulus to cardiac muscle cells.
Hence, option (e) is correct answer.
10.
During late ventricular diastole the atria are contracting and ventricles are relaxing.
Hence, option (a) is correct.
11.
Vasoconstriction and vasodilation happens due to tunica media, vessel layer's activation.
Hence option (C) is correct.
12.
Artery vessels are relatively thick and blood flow is slowest in capillary not in atery.
Lumen of artery is relatively smaller than corresponding vein.
Hence, option (d) is correct answer.
13.
In the lympatic system most invading pathogens are first encountered with secondary lymphatic structure(lymph node).
Hence, option (d) is correct.
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