Respiration In Humans

Question 1

Why does breathing rate still increase after exercise?

Answer 1

This is to provide more oxygen to the muscle cells to repay the oxygen debt. Lactic acid is also removed from the muscles and transported to the liver. In the liver, some of the lactic acid is oxidised to release energy. This energy is used to convert all the remaining lactic acid into glucose. The oxygen debt is repaid when all the lactic acid is converted.

Question 2

What is the path that air takes in the respiratory system?

Answer 2

Nasal Passage - Pharynx - Larynx- Trachea- Bronchi- Bronchioles - Lungs-

Question 3

How are the lungs adapted for efficient gas exchange?

Answer 3

1. The numerous alveoli in the lungs provide a large surface Area.
2. The alveolar wall is one cell thick, providing a short diffusion distance for a faster rate of diffusion.
3. The waIls of the alveoli are richly supplied With bIood capillaries to maintain steep gas concentration gradient.
4. A thin fiIm of moisture covers the surface of the alveolar, allowing oxygen to dissolve for a faster rate of diffusion.

Question 4

How is O² absorbed in your lungs?

Answer 4

The one cell thick alveolar wall that seperates the alveolar air and the blood capillaries is permeable to O² and CO². Since a.air contain a higher concentration of oxygen than blood. Thus O² dissolves in the moisture lining the alveolar wall then diffuses into blood capillaries. O² combines with haemoglobin to form oxyhaemoglobin. This is reversible. When the blood passes through oxygen poor tissues, the oxyhaemoglobin releases oxygen which then diffuses through blood capillaries into the cells.

Question 5

How is CO² removed from your body

Answer 5

As blood passes through tissues via BC., CO² diffuses into blood entering RBC.

Question 6

What is the acronym and changes to the respiratory system in inhalation?

Answer 6

Your diaphragm muscle contracts and diaphragm flattens.
RICE
Your ribs move upwards and outwards. Your sternum also moves up
and forward.
The volume of your thoracic cavity increases.
Your lungs expand and air pressure inside them decreases as the volume increases.
Atmospheric pressure is now higher than the pressure within your lungs.
This forces atmospheric air into your lungs.

Question 7

What happens when you expire?

Answer 7

Your diaphragm muscle relaxes and diaphragm arches upwards.
ERIC
• Your ribs move downwards and inwards. Your sternum also moves down to its original position.
The volume of your thoracic cavity decreases.
Your lungs are compressed and air pressure inside them increases as the volume decreases.
Pressure within the lungs is now higher than atmospheric pressure.
The air is forced out of your lungs to the exterior environment.