Cardiac physiology Q7

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Questions and Answers

what vessel play a major role in controlling blood flow to organ or tissue?

arterioles.

how arterioles control the blood flow to the organs?

*constriction of arterioles; increases the resistance> decrease the blood flow.

dilation of arterioles; decrease the resistance> increase blood flow. regulated by altering the radius/lumen.

arterial pressure is the product of?

cardiac output and the peripheral resistance.

blood pressure rises with advancing age but the magnitude is uncertain

True (A) Signup and view all the answers

in an increased BP, what happens to the CO (Hr, SV) to restore to normal?

decreases. Signup and view all the answers

in an increases BP, what happens to the vessels to restore to normal?

vasodilation. Signup and view all the answers

why bp increases with age advancing?

increased stiffness of large arteries. decreased baroreceptor sensitivity. increased responsiveness to sympathetic nerve activity. alternation in RAA (renin-angiotensin- aldosterone) system. Signup and view all the answers

chronic hypertension

CO and blood volume are normal>hypertension is sustained by increase of the systemic vascular resistance. Signup and view all the answers

the most common causes of secondary hypertension.

kidney disease eg renovascular hypertension, adrenal cortical disorders. Signup and view all the answers

list 6 effects of hypertension on the body,

1- stroke due to brain haemorrhage. 2- damage to capillaries the eye-eyesight damage. 3- oedema. 4- left ventricular hypotrophy (enlarged). 5- damage to kidney blood vessels-renal failure. 6- arterial walls injury which participates in atherosclerosis. Signup and view all the answers

Flashcards

Arterioles' role in blood flow

Arterioles control blood flow to organs by constricting (reducing flow) or dilating (increasing flow) their lumen, thereby altering resistance.

Blood Pressure Components

Blood pressure is determined by cardiac output (heart rate x stroke volume) and peripheral resistance.

Blood Pressure and Age

Blood pressure generally increases with age due to stiffer arteries, decreased baroreceptor sensitivity, and increased sympathetic nervous system activity, and altered RAAS.