The Circulatory System

Question 1

Components of the circulatory system

Answer 1

Heart: muscular organ that transporte blood around the body
Blood vessels
Blood

Question 2

Componentes of blood & functions

Answer 2

1) Platelets: help prevent bleeding
2) white blood cells: fight infection, defend the body
3) red blood cells: transports oxygen, contains haemoglobin
4) plasma: carries nutrients in blood

Question 3

Function of the circulatory system

Answer 3

Transports blood around the body, nutrients, hormones and delivers waste products

Question 4

Arteries function, adaptations

Answer 4

Distributes oxygenated blood around your body, thickest because blood with oxygen experiences greater pressure, needing to be stronger
— thick wall, small lumen: withstand high pressure as it transports oxygen-bound blood

Question 5

Veins function, adaptations

Answer 5

Carry deoxygenated blood back to the heart (apart from pulmonary vein)
— contains valves to prevent backwards blood flow
— large lumen: more efficient
— thinner walls than arteries: more efficient

Question 6

Capillaríes function, adaptations

Answer 6

—Connects smallest branches of veins and arteries
—Allow exchange to occur between blood and body cells through diffusion (pathway solely one endothelial cell thick)

Question 7

Phagocytes

Answer 7

Phagocytosis: processor ingestión of bacteria etc.
Engulf, recognise and absorb waste material in body

Question 8

Lymohocytes

Answer 8

Produce antibodies for pathogens