function of the respiratory system

Question 1

what process allows gas exchange to occur in the lungs

Answer 1

by diffusion

Question 2

what type of transport is diffusion

Answer 2

passive

Question 3

when does the rate of diffusion increase

Answer 3

when distance between blood cells decrease

Question 4

what happens during diffusion in the respiratory system

Answer 4

oxygen in lungs move towards the blood and co2 in the blood moves to the lungs

Question 5

blood has a low concentration of oxygen compared to what

Answer 5

inhaled air in alveoli which has high concentration of co2 compared to the capillaries

Question 6

how do the molecules move from

Answer 6

area of high concentration to low concentration

Question 7

what allows diffusion

Answer 7

thin alveolar epithelium

Question 8

how is the concentration of co2 reversed

Answer 8

reversed in their location compared to oxygen levels

Question 9

what do the capillaries contain high levels of

Answer 9

co2

Question 10

what do the alveoli contain high levels and low levels of

Answer 10

high oxygen and low co2

Question 11

where does carbon dioxide diffuse

Answer 11

into the alveoli

Question 12

where does oxygen diffuse

Answer 12

capillaries

Question 13

what does inhalation do

Answer 13

brings in oxygen

Question 14

what does exhalation do

Answer 14

brings out co2

Question 15

what does ventilation occur as

Answer 15

combination of muscle action and negative pressure

Question 16

what does the diaphragm and intercostal muscles between the ribs do

Answer 16

contract simultaneously to increase volume of the lungs

Question 17

what does the contraction of the diaphragm and intercostal muscles do

Answer 17

decreases pressure in lungs and draws in air

Question 18

what happens when the diaphragm and intercostal muscles relax

Answer 18

causes reduction in lung volume and increase pressure in lungs causing air to be pushed out

Question 19

what is periodic inhalation

Answer 19

inhalation of air

Question 20

what is expiration

Answer 20

expulsion of air

Question 21

what does periodic inhalation and expiration do

Answer 21

clears out air rich in co2 and replaces it with air rich in oxygen

Question 22

what is tidal volume

Answer 22

the amount of air breathed in and out during a normal breath

Question 23

what is residual volume

Answer 23

small amount of air rich in co2 remains trapped in alveoli after expiration and mixes with air rich in oxygen brought in during inspiration

Question 24

what are the breathing control centers in the brain

Answer 24

medulla oblongata

Question 25

what does the medulla oblongata control

Answer 25

respiration

Question 26

how does the medulla oblongata control respiration

Answer 26

monitoring co2 levels and blood ph

Question 27

what happens if blood ph starts to decrease

Answer 27

respiration rates will increase to balance co2 and oxygen levels