Biology Unit 4 Circulation Flashcards

Flashcards about Biology Unit 4 Circulation

Red Blood Cell Structure

Large surface area, contains haemoglobin to pick up oxygen, no nucleus to make room for more oxygen.

Red Blood Cell Function

Carries oxygen from the lungs to the body and carbon dioxide from the body to the lungs.

White Blood Cell (Phagocytes) Function

Moves around and engulfs bacterium.

Plasma

Liquid part of blood. A dilute solution of salts, glucose, amino acids, vitamins, urea, protein and fats.

White blood cell

Involved in immune system

Platelets

Involved in blood clotting

Red Blood cells

Involved in carrying oxygen

How does blood circulate around the body?

1. Pumped by the heart. 2. Oxygenated blood travels to organs in arteries. 3. Arteries branch into capillaries which take the blood through the organs. 4. Capillaries then join to form veins. 5. Veins carry deoxygenated blood back to the heart.

Cardiovascular disease

Set of diseases that affect the heart and blood vessels

Coronary arteries

Branch off of the aorta and supply the heart muscle with O2.

Heart attack

Failure of the heart to function properly

Atherosclerosis

Artery narrowed by plaque making it difficult for blood to flow; smaller arteries can be blocked completely.

Angina

Chest pains resulting from reduced blood flow due to atherosclerosis.

Stroke

Can result if a blood vessel is blocked in the brain.