what are the main functions of heart ?..
please don't give silly answers
Answers
Explanation:
Blood carries oxygen and other important nutrients that all body organs need to stay healthy and to work properly. Your heart is a muscle, and its job is to pump blood throughout your circulatory system.
Follow pls☺
#its Sayan✌
Explanation:
Your heart is roughly the size of a fist and sits in the middle of your chest, slightly to the left. It’s the muscle at the centre of your circulation system, pumping blood around your body as your heart beats. This blood sends oxygen and nutrients to all parts of your body, and carries away unwanted carbon dioxide and waste products.
Structure of your heart
Your heart is made up of three layers of tissue:
epicardium
myocardium
endocardium
These layers are surrounded by the pericardium, a thin outer lining protecting your heart.
There are four chambers that make up the heart – two on the left side and two on the right.
The two small upper chambers are the atria. The two larger lower chambers are the ventricles. These left and right sides of the heart are separated by a wall of muscle called the septum.
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).
The right side of the heart receives blood that is low in oxygen because most has been used up by the brain and body. It pumps this to your lungs, where it picks up a fresh supply of oxygen. The blood then returns to the left side of the heart, ready to be pumped back out to the brain and the rest of your body.
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
capillaries - they connect the smallest arteries to the smallest veins, and help exchange water, oxygen, carbon dioxide and other nutrients and waste substances between the blood and the tissues around them
veins - they carry blood, lacking in oxygen, back towards your heart, and get bigger as they get nearer your heart
Blood vessels are able to widen or narrow depending on how much blood each part of your body requires. This action is partly controlled by hormones.