exercise, heart rate and adrenaline

Question 1

why is a double circulatory system better than a single one

Answer 1

because the oxygenated blood is kept seperate from the deoxygenated blood

Question 2

which ventricle has a thicker wall and why

Answer 2

left, because it carries oxygenated blood which needs to be pumped throughout the entire body while the right v only needs to pump blood to the lungs- left ventricle needs to be stronger

Question 3

what happens to the heart rate and strength of cardiac muscle contractions during exercise

Answer 3

heart increases, strength of the contractions increases so blood flow increases

Question 4

what is stroke volume

Answer 4

amount of blood pumped out during each heart beat

Question 5

stroke volume ______ during exercise

Answer 5

increases

Question 6

what is adrenaline

Answer 6

a hormone

Question 7

what is adrenaline responsible for

Answer 7

the flight or fight response

Question 8

what does adrenaline do

Answer 8

increases alertness, increases ability to respond to potentially dangerous situations

Question 9

effects of adrenaline (5)

Answer 9

• increased heart rate
• dilation of pupils
• sweating
• decreased sensitivity to pain
• diverting blood flow from digestive system to muskoskeletal system