83. Short term mechanisms for regulating blood pressure include all, except a. H
ID: 3483283 • Letter: 8
Question
83. Short term mechanisms for regulating blood pressure include all, except a. Hormonal regulation b. Aortic sinus reflex c. Carotid sinus reflex d. Heart beat rate changes 84. Long term mechanisms regulate blood pressure a. By hormone control b. By adjusting blood volume c. By conserving body fluids by the kidney d. By stimulating fluid intake e. All of the above 85. Vagus nerve innervation causes the following changes, EXCEPT a. Arteriole dilation b. Decreased heart rate c. Decreased cardiac contractility 86. The regulation of blood pressure is maintained by sensory receptors sensitive to a. Stretch via baroreceptors b. Oxygen via chemoreceptors c. Carbon dioxide via chemoreceptors d. pH via chemorecptors e. all of the above 87·The speed of blood flow a. Is the slowest in veins because of the remoteness from the heart b. Is the slowest in capillaries due to the blood pressure being zero c. Is fastest in capillaries due to the enormous surface area d. Is the slowest in capillaries due to the greatest total cross-sectional area 88. Shock can be caused by a. Hemorrhage b. Severe dehydration caused by burns c. Damage to the myocardium d. Severe vasodilation e. Any of the above 89. Which statement below is NOT true about blood vessels a. Arteries are the vessels with the most smooth muscle and elastic tissue b. Veins always carry oxygen poor blood c. Capillaries are only one cell layer thinlk d. Arterioles usually have smooth muscle sphincters that regulate blood flow through capillany beds. Pg 12Explanation / Answer
1.hormonal mechanism is not a oart of short term regulatory mechanism .example -renin angiotensin aldisterone mechanusm for longterm regulation o f blood pressure.
Baroreceptore reflfex and change in heart rate these are of short term regulatory mechanism
2.all of the above i.,e hirmonal mechanism (RAAS) mechanism .adjusting blood volume ,increase fluid intake all of these are long term regulatory mechanism
3vagus nerve is not supplied to ventricles of heart so when denervation there will be no effects on cardiac contractility.
It is supplied to sa node and arteriole so there is decrese in heart ratevand arteriolar dilatation.so optionC.
4reguoation of blood pressure is maintained by baroreceptor i.e, carotid sinus and aortic sinus sensitive to stretch..rest all the reponsible for regulation of respiration.
So option A .
88.shock can be caused by haemirrhge, burn,intese vasodilatation.any of the above .so option E.
89.pulmonary vein carry oxygenated blood so not all the vein.
So option B
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