Question

Describe the function of the heart.​

Answer 1

Explanation:

Structure of your heart

Your heart is made up of three layers of tissue:

• epicardium

• myocardium

• endocardium

Circulatory system

Your heart pumps blood around the body all the time - about five litres (eight pints) of it - and this is called circulation. Your heart, blood and blood vessels together make up your cardiovascular system (or heart and circulatory system).

Blood vessels

Your blood is pumped around your body through a network of blood vessels:

• arteries - they carry oxygen-rich blood from your heart to all parts of your body, getting smaller as they get further away from the heart

Valves

Your heart has four valves. They act like gates, keeping the blood moving in the right direction:

• aortic valve - on the left side

• mitral valve - on the left side

• pulmonary valve - on the right side

• tricuspid valve - on the right side

Electrical system 

The electrical signal starts in the right atrium where your heart’s natural pacemaker - the sino–atrial node - is situated. This signal crosses the atria, making them contract. Blood is pumped through the valves into the ventricles.

Blood pressure

This is the measurement of the pressure within the arteries. It plays a vital role in the way your heart delivers fresh blood to all your blood vessels. For blood to travel throughout your body quickly enough, it has to be under pressure. This is created by the relationship between three things:

• your heart’s pumping action

• the size and stretchiness of your blood vessels

• the thickness of the blood itself

Answer 2

Answer:

The right auricle and ventricle receive blood with carbon dioxide from all parts of the body. The collected blood is then pumped to the lungs for the purification. In lungs, the exchange of gases takes place and purified blood is sent back to left auricle. It pumps it to the left ventricle, which in turn pumps off the purified blood to all parts of

body through arteries