Arterioles function a as the main resistance vessels in the

Arterioles function ________. a. as the main \"resistance\" vessels in the cardiovascular system b. to remove the pulsatile pressure waves in blood and send smooth blood flow into capillaries c. to direct blood to and from various organs or regions by vasoconstriction vasodilation d. All of the above e. Only a & b The \"conduction system\" of heart accomplishes __________. a. a delay in time allowing ventricles to fill with blood. b. \"shuttling\" of the AP (depolarization wave) to the apex of the ventricles c. allowing the \"signal\" to be spread from atria to ventricles d. All of the above Only a & b Which of the following would be an effective treatment for someone in shock? 1. sympathomimetic drugs 2. a warm blanket 3. pushing intravenous (TV) fluids 4. Stop any visible bleeding 5. blood transfusion 6. injection of epinephrine a. 1, 2, 3 b, 2, 4, 5, 6 c. 2, 3, 5 d. 1, 2, 4, 5, 6 e, 1, 2, 3, 4, 5, 6 The only blood vessels where gas and nutrient exchange occurs are the ________. a. arterioles b, venules C. aorta d, capillaries e. all blood vessels The part of the conduction of the heart that actually delivers the signal to the cardiac muscle cells in the myocardium of the heart is/are the ____________. a. Purkinje fibers. b. Av node c Av bundle d Bundle branches in the interventricular septum e. all of the above The __________ in cardiac muscle is due to the slow influx of Ca^2+ into the cell maintaining a state of depolarization for-250 msec. a. Plateau phase b. Frank-Starling Law of the Heart c. Hyperpolarization phase d. All of the above e. Both b & c

Solution

Question No. 81

The answer to this question would be d-all of the above. An arteriole is a small diameter blood vessel which forms part of the microcirculation which extends from an artery and leads to capillaries. The points stated in the options are the important functions of it.

Question number 82

The answer to this question would be d- all of the above. Only after effective signalling as stated in the options, does the conduction system of the heart functions.

Question number 83

The answer to this question should be e- 1,2,3,4,5,6. When a person is in a state of shock, any visible bleeding should be stopped immediately and assure a warm blanket to keep him warm. Epinephrine ( sympathomimetic drug) has amazing abilities to constrict blood vessels which lessen low blood pressure, opens airways to reduce breathing difficulties and to ease faint feelings. IV fluids should be administered to the patient for hemodynamic balance to occur. Blood transfusion becomes important if there is heavy blood loss.

Question number 84

The answer to this question should be d-capillaries. Capillaries are one-cell thick blood vessels and it is densely distributed in the body which makes it accessible to almost all cells. Gases ( Oxygen and Carbon dioxide), nutrients and wastes pass in both directions across the capillary walls.

Question number 85

The answer to this question should be e- all of the above. Following is the signalling pattern:

SA Node--->AV Node-->Bundle of His-->Bundle branches--> Purkinje fibers.

Question number 86

The answer to this question should be a- Plateau phase. This phase ensures that the action potential lasts almost as long as the contraction of the cell, which helps to ensure unidirectional excitation. Due to this phase, cardiac muscle fibres remain contracted longer than skeletal muscle fibres.