Regulating BP

Question 1

Requirements

Answer 1

• coordination of the heart, blood Vessels, and kidneys
• supervised by the brain
• BP=CO*PR

Question 2

Peripheral resistance

Answer 2

Def: amount of friction blood encounters as if flows through blood vessels
-depends on: diameter (smaller, higher PR), blood viscosity (thicker, higher PR), total blood vessel length (longer, higher PR)

Question 3

ANS

Answer 3

• increased BP stimulates barorecptors in carotid sinuses causing the brain to:
• inhibit the vasomotor centre, dilating arteries and veins
• inhibit cardioacceleratory centre and stimulating cardioinhibitory centre, decreasing HR, CO

Question 4

SNS

Answer 4

• E and NE (adrenaline) released in a fight or flight situation
• vasoconstriction in skin and abdominal organs
• vasodilation in cardiac and skeletal muscle
• increased PR; BP

Question 5

Kidneys and BV

Answer 5

• decreased BP causes kidney to conserve water, increasing BP
• increased BP caused kidney to eliminate water, decreasing BP

Question 6

Temperature

Answer 6

Heat: causes vasodilation
Cold: causes vasoconstriction

Question 7

Chemicals

Answer 7

• E increases BP AND HR
• alcohol and histamine decrease BP, vasodilation
• nicotine increases BP, vasoconstriction

Question 8

Diet

Answer 8

-diet low in salt, saturated fats and cholesterol prevent hypertension