2.7 absorption of materials

Question 1

function of diffusion

Answer 1

movement of molecules from a higher concentration gradient to a lower concentration down a concentration gradient

Question 2

term consintration gradient

Answer 2

difference between concentrations of a substance in two diff areas

Question 3

substances that enter and leave body by diffusing

Answer 3

oxygen and glucose diffuse into cells by diffusion from a higher concentration inside cell to a higher concentration lower concentration outside cell

carbon dioxide will diffuse out of cells from a higher concentration inside the cells to a lower concentration outside cells

Question 4

chemicals that diffuse

Answer 4

glucose and oxygen will diffuse into cells as these are raw materials for respiration

carbon dioxide will diffuse outside cell as this is a waste product of respiration

Question 5

substances that must be delivered to all body cells in bloodstream for respiration

Answer 5

glucose and oxygen and raw materials for respiration

Question 6

product that should be removed from all body cells carried away by bloodstream

Answer 6

waste product produced by respiration that must be removed from respiring cells is carbon dioxide

Question 7

blood vessels involved in exchange of materials in body tissues

Answer 7

capillaries

Question 8

function of lungs

Answer 8

gas echange organs used to take oxygen into bloodstream and remove co2 from bloodstream

Question 9

structures in lungs that provide a large surface area for gas exchange

Answer 9

made up of large number of alveoli which provide large surface area for gas exchange

Question 10

movement of gases between aveoi and capillaries during gas exchange

Answer 10

oxygen diffuse from aveoli into blood capillaries co2 diffused out from blood capillaries into aveoli

Question 11

features of a aveoli which increases the efficiency of gas exchange

Answer 11

large surface areas
thin walls
next to blood capillary due to extensive blood supplie to ensure rapid transport of blood and re establishment of concentration gradient for diffusion

Question 12

function if small intestine

Answer 12

absorb the products of food digestion into bloodstream

Question 13

structures of small intestine that provides large surface area for absorption

Answer 13

has highly formed inner lining which is covered with finger like projections called villi that provides a large surface area for absorption of nutrients

Question 14

structures found inside villi

Answer 14

network of capillaries and a lacteal

Question 15

absorption of key nutrients food into structures of villus

Answer 15

capillaries networks absorbs glucose and amino acids and lacteal absorbs fatty acids and glycerol

Question 16

3 common features seen in absorption surfaces to increase effluence of absorption

Answer 16

large surface area
thin walls
extensive blood supply