B4 The Heart & Circulatory System

Question 1

Right Atrium, Right Ventricle

Answer 1

Right Atrium- receives oxygen-poor blood from the body and pumps it to the right ventricle
Right Ventricle- Right side pumps deoxygenated blood to the lungs.

Question 2

Left atrium and Left Ventricle

Answer 2

Left atrium- left side pumps oxygenated blood to the body.
Left ventricle- blood flows in on direction- valves stop it.

Question 3

Double Circulatory System

Answer 3

.first circuit: heart - lungs - Heart
Second circuit : Heart - Body - Heart

Question 4

Arteries

Answer 4

Function: carry blood to the heart
Structure: thick walls,small lumen, high pressure
Veins function : carry blood to the heart
Structure! Thinner walls, large lumen,valves to stop backflow

Question 5

Capillaries Function

Answer 5

Function: where exchange of gases/ nutrients happens
Structure: very thin walls (1 cell thick) , tiny

Question 6

Breathing System

Answer 6

Nose/Mouth- air enters
Trachea (windpipe) - carries air to lungs
Bronchi- Trachea splits into two tubes ons to each lung
Bronchioles- Smaller branches inside lungs
Alveoli- Tiny air sees where gad exchange happens
Diaphragm- Muscle under lungs that helps breathing

Question 7

Gas Exchange (Alveoli)

Answer 7

.large Surface area
.Thin walls
.Good blood supply