23 - Heart & Transport in Humans

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away from heart. thick walls, small lumen, flows in pulses, lot of pressure from heart

towards heart. thin walls, large lumen, valves, flows steadily, low pressure from heart

one cell thick, very narrow lumen.

Arterioles, venules

tough protective sac around the heart

Draw the heart

systole

diastole

the expansion and contraction of the arteries due to the pumping action of the heart

the force of blood as it passes through an artery

a pale yellow coloured fluid containing water, white blood cells, proteins and lipids

(no red blood cells or platelets)

blind ending tubes that carry lymph. many lymph vessels have valves

small swellings along the length of many lymph vessels. lymph nodes filter bacteria and produce and store white blood cells

• Collect & return tissue fluid to the blood
• Fight infection
• Transport digested fats & hormones