Biology- respiration and circulation

HideShow resource information
  • Created by: Izzybc
  • Created on: 04-10-15 11:45
What is breathing?
The process in which an organism inhales and exhales to take in and let out air- so the oxygen from the air can diffuse into the bloodstream and carbon dioxide can diffuse out of the bloodstream, into the air
1 of 10
Label this diagram .
(a) trachea (b) ribs (c) intercostal muscles (d) alveoli (e) bronchi (f) bronchioles (g) lungs (h) diaphragm
2 of 10
What is respiration?
The process which occurs in the mitochondria of all cells, converting oxygen and glucose into carbon dioxide, water and releasing energy
3 of 10
What happens when you breathe in?
intercostal muscles contract pulling ribs upwards and outwards. Diaphragm muscles contract to move the diaphragm down; increases volume of thorax, pressure in lungs decreases. Because pressure in lungs is lower than in air, air moves into your lungs
4 of 10
Why can oxygen continually diffuse into the blood?
The oxygen rich air in your lungs maintains a steep concentration gradient with the blood
5 of 10
What happens when you breathe out?
intercostal muscles relax, causing ribs to drop down and in again. the diaphragm muscles relax to move the diaphragm back up; volume in thorax decreases, pressure in thorax increases- the air is squeezed and forced out of lungs.
6 of 10
How are the alveoli adapted for gaseous exchange? pt 1
(1) they are a spherical shape- provides a large surface area, (2) very thin (one cell thick) alveolus walls-provides a short diffusion path
7 of 10
How are the alveoli adapted for gaseous exchange? pt 2
3)ventilated- by removingwaste CO2 and replenishing oxygen levels in the alveolar air maintains steep concentration gradient, (4)surrounded by blood capillaries- ensures a good blood supply, maintains steep concentration gradient
8 of 10
What is gaseous exchange?
gaseous exchange involves two or more gases being transferred in opposite directions across a respiratory surface
9 of 10
Why do we breathe spontaneously?
the brain sends impulses to the muscles in diaphragm and intercosal muscles to contract and relax constantly
10 of 10

Other cards in this set

Card 2

Front

Label this diagram .

Back

(a) trachea (b) ribs (c) intercostal muscles (d) alveoli (e) bronchi (f) bronchioles (g) lungs (h) diaphragm

Card 3

Front

What is respiration?

Back

Preview of the front of card 3

Card 4

Front

What happens when you breathe in?

Back

Preview of the front of card 4

Card 5

Front

Why can oxygen continually diffuse into the blood?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Respiration and exercise resources »