Match the following: 11) Found in the interventricular septum 12) The pacemaker

Question

Match the following: 11) Found in the interventricular septum 12) The pacemaker of the heart. 13) The point in the conduction system of the heart where the impulse is temporarily delayed 14) Network found in the ventricular myocardium. A) AV bundle B) AV node C) SA node D) Purkinje fibers Match the following: 15) Site where exchanges of food and gases are made. 16) Site where resistance to blood flow is greatest. 17) Site where the blood pressure is greatest. 18) Site where the blood volume is greatest. 19) Site where the velocity of blood flow is slowest. 20) S ite that is the major determinant of peripheral resistance A) Arterioles B) Capillaries C) Large arteries D) Large veins

Explanation / Answer

11-A

the AV bundle is also called bundle of HIS it is specialised myocytes for conducting the impulse from av node to endocardium of heart.it divided into right and left AV bundle

12-C

sino atrial node (SA node) is the pace maker of heart.these are bunch of cells situated in right atrium.

13-B

atria ventricular node is the node which receive impulse from the atria myocardium.it is present inferior to atria and present near the inter ventricular septum.it is triggered by calicuim channels

14-D

purkinje fibers are the network found in the ventricular myocardium.these are the branches arise from the av bundle.

15-B

capillaries are the minute blood vessels which provide blood flow at tissue level.capillaries are the junctions of arteries and veins.gases are exchanged by simple diffusion across the membrane.

16-D

large veins contains the valves which resist the blood flow against gravity

17-C

large arteries are the blood vessel where the greater blood pressure is found because they are directly connect to heart(eg:aorta)

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