Circulatory system

Question 1

Diagram

Answer 1

see notes

Question 2

Cardiac cycle

Answer 2

1. Atria receives blood from from veins
SA node sends electrical signal
SA node found in the wall of right atrium near superior vena cava
Atria contracts(systole)
blood flows in ventricle

2 Av node receives signal from SA node
AV nodes sends signal throughout nerves in cardiac muscle
AV node found at the bottom of right atrium near the septum
Ventricle systole
Tricuspid and Bicuspid valves close and semi-lunar valves open
blood pumped into pulmonary artery and aorta.

Question 3

Pulse

Answer 3

alteration of contraction and relaxation of an artery

Question 4

Blood pressure

Answer 4

Force of blood on the walls of the blood vessels

Question 5

Closed system

Answer 5

blood flows continuously in a network of totally enclosed blood vessels. Blood never leaves

Question 6

Open system

Answer 6

around cells = most invertebraes

Question 7

Artery

Answer 7

Carries blood away from heart using powerful pulses
carry oxygenated blood apart from pulmonary artery
Elastic walls due to pulse pressure

Question 8

Vein

Answer 8

Carries blood towards the heart

Carries deoxygenated blood

Question 9

Capillary

Answer 9

Blood vessel which is one cell thick

carries blood from ateriole to venule