Heart Structure

Question 1

Blood supply to heart muscle:

Answer 1

Coronary arteries supply heart muscle with glucose and oxygen
Coronary veins transport CO2 and other WASTES from heart muscle

Question 2

Internal features of the heart:

Answer 2

Chambers
HEART VALVES PREVENT BACKFLOW OF BLOOD
vessels attached to the heart

Question 3

Cardiac muscle:

Answer 3

MYOGENIC

Striated fibres joined together end to end to form a UNITED NETWORK

Question 4

Heart structure consists of 3 layers:

Answer 4

Pericardium
Myocardium
Endocardium

Question 5

1st layer is the pericardium which is a…

Answer 5

Double layered bag surrounding the heart

Contains pericardial fluid which reduces friction between layers

Question 6

2nd layer is the myocardium, which is…

Answer 6

Striped cardiac muscle tissue
Atrial walls are thin because they only pump blood back into the lower chambers
Ventricular walls are thicker
LEFT VENTRICLE: THICKER - PUMP TO MAIN BODY

Question 7

3rd layer is the endocardium, which is…

Answer 7

Inner glistening membrane

REDUCES FRICTION between HEART MUSCLE and FLOWING BLOOD