How do we breath

Question 1

Respiration

Internal

Answer 1

• Betwen cells and blood

Question 2

Respiration

External

Answer 2

Between the alveoli and the blood

Question 3

Inhalation

Answer 3

Rib (intercoastal muscles) they contract - Rib cage moves up and out - Diaphragm contracts (moving downwards)
- Reduces air pressure
- Air moves from high pressure area into low pressure area and the air is drawn into the lungs

Question 4

Exhalation

Answer 4

Rib cage and diaphragm relax - returning to resting postion - decrease in chest cavity volume and increase in air pressure.
- The air will flow from high pressure to low pressure within the lungs

Question 5

Factors that affect the regulation of breathing rate

Answer 5

Chemical reciptors in the brain and ateries that monitor the levels or Co2 and Oz
- Medulla sends signals to the rib muscles and diaphragm to either speed up or slow down the rate of breathing
- Breathing is involuntery (Ans actions)

Question 6

Regulation of Breathing movement

Answer 6

When you dont breath there is an increase of C0z in the blood
- Carbon dioxide reacts with water which activate carbonic acid (which creates a acidic enviroment) this activites the meddula oblongata
- Meddula oblongata sends a messege to the diaphargm and rib muslces to contract causing inhalation

Question 7

Pathway of oxygen (O2)

Answer 7

The oxygen reaches e lungs it diffuses from alveoli to cappilaries

Question 8

Pathway of oxygen and carbon dioxide

Answer 8

• Oxygen diffuses into the cell
• the co2 diffues out of the cells into the blood and dissolves in plasma. It either gets attached to the hemogloblin as Co2 or it travels through the blood as bicarbonate ions.

Question 9

Pathway of Carbon dioxide

Answer 9

• deoxygenated blood is pumped back to the heart where it is pumped to the lungs
• In the lungs the Co2 is relased and diffueses from the cappillaries to the alveoli
• Co2 is expelled (exhalation)

Question 10

tidal volume

Answer 10

The amount of air exhaled and inahaled after each breath

Question 11

Total lung capacity

Answer 11

The maximum volume of air inhaled during a signle breath

Question 12

Inspiratoy reserve volume

Answer 12

The volume of air that can be forcibly be inhaled after a normal inahaltion

Question 13

Expiratory reserve volume

Answer 13

The volume of air that can be forcibly exhaled after a normal exhalation

Question 14

Residual volume

Answer 14

The volume of air remaining in the lungs after a forced exhalation

1-1.5L of air that always remains in the lungs

Question 15

Vital capacity

Answer 15

The maximum amount of air that can be inhaled or exhaled