Biology- respiration and circulation

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  • 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
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Label this diagram .
(a) trachea (b) ribs (c) intercostal muscles (d) alveoli (e) bronchi (f) bronchioles (g) lungs (h) diaphragm
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What is respiration?
The process which occurs in the mitochondria of all cells, converting oxygen and glucose into carbon dioxide, water and releasing energy
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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
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Why can oxygen continually diffuse into the blood?
The oxygen rich air in your lungs maintains a steep concentration gradient with the blood
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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.
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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
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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
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What is gaseous exchange?
gaseous exchange involves two or more gases being transferred in opposite directions across a respiratory surface
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Why do we breathe spontaneously?
the brain sends impulses to the muscles in diaphragm and intercosal muscles to contract and relax constantly
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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
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