Biology- Circulatory System

Circulatory System Function

The function of the circulatory system to carry nutrients and wastes to and from different parts of the body

Three Main Structures of the Circulatory System

The Vessels, The blood, The heart

Closed Circulatory System

Blood stays in the blood vessels

3 Major Loops for Blood flows

Pulmonary Circulation, Systemic Circulation, Cardiac Circulation

Three Types of Blood Vessels

The Arteries, The Veins, The Capillaries

Capillary Beds

Collection of Capillaries joining an arterioles to a venule

Red Blood Cells

Contain Haemoglobin, a molecule designed to and carry oxygen to all the cells

White Blood Cells

Contain nucleus and fight infections

Plasma

About 55% of blood is a straw-coloured liquid that dissolves and carries non-cellular components

The Heart

Pumps blood through the vessels

Pulmonary Loop

Carries deoxygenated blood from the heart to the lungs and back to the heart

Systemic loop

Carries oxygenated blood from the heart to the body and back to the heart

Aorta

Takes oxygenated blood from the heart to the body

3 Steps for Heartbeat

Atrial Systole, Ventricular Systole, Systole

Systolic Pressure

Pressure that leaves the blood exerts on the blood when blood leaves the heart during systole

Diastolic Pressure

When pressure that the blood exerts on the aorta when no blood leaves the heart during systole

Stroke

Caused by a blockage of an artery supplying the brain, cutting off the supply of O2 to brain cells

Heart Murmur

One or more of the heart valves does not open or close properly

4 main components of blood

Liquid plasma, White blood cells, Platelets, Red blood celsl

Capillary bed

A network of capillaries