Heart Anatomy

Question 1

describe the hearts position

Answer 1

the heart lies aboves the diaphragm and near the midline and ways between 250 to 300 grams

Question 2

what is the mediastinium

Answer 2

the mediastium is where the heart lies and it is a mass of tissue which extends from the sternum down to the vertebral column between the lungs

Question 3

what is the pericardium and its function

Answer 3

the pericardium is fibrous tissue which surrounds the heart and it works to protect the heart and hold its position in the mediastinium

Question 4

describe the fibrous pericardium

Answer 4

outer layer
tough and inelastic

Question 5

describe the serous pericardium

Answer 5

thin and has 2 layers the outer parietal and the inner visceral

Question 6

name the 3 layers of the hearts wall

Answer 6

outer - epicardium
middle - myocardium
inner - endocardium

Question 7

describe the myocardium

Answer 7

this is the middle layer of the hearts wall which is composed of cardiac muscle and is responsible for the hearts pumping action

Question 8

describe the endocardium

Answer 8

the endocardium is the hearts inner wall and is composed of a thin squemnous epithilium layer.

it is responsible for the lining of the myocardium and the blood vessels

Question 9

describe the hearts chambers and connecting vessels

Answer 9

There is the right atrium and ventricle and the left atrium and ventricle.
And the connecting blood vessels are:

Pulmonary artery- carries deoxygenated blood to the lungs from the right ventricle.

Vena cava – carries deoxygenated blood from the body into the right atrium

Pulmonary vein - carries oxygenated blood from the lungs into the left atrium

Aorta - carries oxygenated blood from the left ventricle to the body