Transport in Humans (circulatory system)

Question 1

describe the composition of blood

Answer 1

plasma 55%
red blood cells 45%
white blood cells + platelets <1%

Question 2

what is blood

Answer 2

blood is a fluid that transports substances around the body

Question 3

what substances are delivered by the blood

Answer 3

-oxygen
-carbon dioxide
-digested food (e.g glucose, amino acids)
-thermal energy (heat)
-hormones
-urea

Question 4

main function of the circulatory system

Answer 4

its important to deliver reactants of respiration, and to dispose of waste products of respiration

Question 5

structure & function of red blood cells

Answer 5

structure = biconcave shape; no nucleus; contain haemoglobin

function = transport oxygen (and some carbon dioxide)

Question 6

structure & function of white blood cells+type

Answer 6

structure = large blood cells; lobed nucleus

function = engulf pathogens; make antibodies to fight infections

types = lymphocytes & phagocytes

Question 7

structure & function of plasma

Answer 7

structure = straw-coloured liquid, made mostly of water

function = to carry carbon dioxide, nutrients (digested food), hormones, heat, urea

Question 8

structure & function of platelets

Answer 8

structure = fragments of cells

function = to clot blood at a wound to prevent infection and blood loss

Question 9

pathogen definition

Answer 9

an organism or virus that causes a disease