SP8a Efficient Transport and Exchange

Question 1

aerobic respiration

Answer 1

a type of respiration in which oxygen is used to release energy from substances such as glucose

Question 2

alveolus

Answer 2

a small pocket in the lungs in which gases are exchanged between the air and the blood

Question 3

capillary

Answer 3

a tiny blood vessel with thin walls to allow for the transfer of substances between the blood and tissues

Question 4

circulatory system

Answer 4

the system that moves blood through the body - consisting of the heart, arteries, veins and capillaries

Question 5

diffusion

Answer 5

the random movement and spreading of particles - there is a net diffusion of particles from a region of high concentration to a region of lower concentration

Question 6

excretion

Answer 6

the removal of waste materials that have been produced inside an organism

Question 7

gas exchange

Answer 7

a process in which one gas diffuses across a membrane and another gas diffuses in the opposite direction

Question 8

metabolism

Answer 8

all the chemical reactions that occur in an organism

Question 9

multicellular organism

Answer 9

an organism that is made up of many cells

Question 10

surface area : volume ratio

Answer 10

the total amount of surface area of an object divided by its volume - the bigger the ratio, the more surface area something has per unit volume

Question 11

urea

Answer 11

a waste product made in the liver from excess amino acids