Respiratory System

Question 1

Internal respiration

Answer 1

Oxygen in the blood is exchanged with the cell of the tissue

Carbon dioxide moves opposite direction

Question 2

External respiration

Answer 2

Gas in the air is exchanged with the blood in the capillaries of the lungs

Question 3

Ventilation

Answer 3

Air is drawn in and out of the lungs

Question 4

Mechanism of external respiration

Answer 4

1. Oxygen is drawn into the blood and the carbon dioxide shows a net movement from the blood back into the alveolar air
2. Oxygen transported to tissues in the body
3. Carbon dioxide transported back from tissues to lungs to be expelled

Question 5

Upper respiratory tract

Answer 5

1. Point of entry for air to/from lungs
2. moistens air makes it easier to be diffuser through lungs
3. protects lungs by filtering blood so that no harmful things such as bugs can enter lower respiratory tract
4. Seperates food and air
5. Olfactory sensation; sense of smelling

Question 6

Air movement to lower tract

Answer 6

Nasal cavity : first point of entry of air because of nares

Air passes via vistubule to nasal conchae which moistens air and the hairs trap harmful substances

Question 7

Nasopharynx

Answer 7

Connected to mouth: second entry point for air and connect to trachea

Question 8

Oropharynx

Answer 8

Divides to trachea and oesophagus- trachea is air pathway to the lungs

Question 9

Role of the epiglottis

Answer 9

Flap like structure that covers trachea to prevent food entering it