respiratory system

Question 1

what is the pathway of oxygen?

Answer 1

air enters the body through the nose or mouth and into the nasal passages
air then passes through the pharynx and over the epiglottis and larynx
air goes into the trachea and divides into either of the bronchi
these then divide again into bronchioles still carrying air down into the alveoli
this then diffuses into the capillaries for respiration

Question 2

what is the epiglottis?

Answer 2

a flap of skin that stops food going the wrong way

Question 3

how are alveoli specialised?

Answer 3

they have thin walls for shorter diffusion distance
they have a large surface area to increase rate of diffusion

Question 4

what is exchanged in the alveoli during gaseous exchange?

Answer 4

carbon dioxide and oxygen

Question 5

what is haemoglobin and how is oxihaemoglobin different?

Answer 5

haemoglobin is a protein in the blood that that binds to and transports (4) oxgens and carbon doxide
oxihaemoglobin is the chemical formed when oxygen has bound to haemoglobin