respiratio

Question 1

why alveoli has a large surface area

Answer 1

numerous alveoli increase sirface area forgaseous exchange to occur quickly

Question 2

why alveoli has a capillary network

Answer 2

to remove gas away so conc gradient of each gas is maintainedconstantly between blood and lungs

Question 3

what is aerobic respiration

Answer 3

breakdown of food in presence of oxygen

Question 4

how is there gaseous exchange

Answer 4

a conc gradient for each gas between spaces in alveoli and blood so gaseous exchange is carried out by process of diffusion

Question 5

what is anaerobic respiration

Answer 5

breakdown of food in presence of oxygen

Question 6

how does lactic acid lead to oxygen debt in muscles

Answer 6

if need more energy carry out anaerobic respiration and alctic acid is formed .will be oxidised to carbon dioxide and water in liver using up oxygen in process and producing energy.Accumulation of lactic acid creates oxygen debt.it is then removed and coverted to glucose and transported back

Question 7

functions of trachea

Answer 7

epithelium in trachae consists of vilated cells. that secrete mucus and form thin film over internal lining to trap dust or bacteria

Question 8

functions of alveoli

Answer 8

cluster of airsacs
one cell thick epithelium for easy diffusion
large sa for exchange of gases
thin layer of moisture to allow gas absorb into lining of alveoli