Higher human biology
This presentation is the property of its rightful owner.
Sponsored Links
1 / 20

Higher Human Biology PowerPoint PPT Presentation


  • 65 Views
  • Uploaded on
  • Presentation posted in: General

Higher Human Biology. Unit 2 The Need for Transport. Which has the largest surface area to volume ratio?. side of cube. side*side. Area of Side. side*side*6. Area of Cube's Surface. side*side*side. Volume. Ratio of Surface Area to Volume. 2. 2*2. 4. 2*2*6. 24. 2*2*2. 8. 3 to 1.

Download Presentation

Higher Human Biology

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Higher human biology

Higher Human Biology

Unit 2

The Need for Transport


Higher human biology

Which has the largest surface area to volume ratio?


Higher human biology

side of cube

side*side

Area of Side

side*side*6

Area of Cube's Surface

side*side*side

Volume

Ratio of Surface Area to Volume

2

2*2

4

2*2*6

24

2*2*2

8

3 to 1

4

4*4

16

4*4*6

96

4*4*4

64

3 to 2

6

6*6

36

6*6*6

216

6*6*6

216

3 to 3

8

8*8

64

8*8*6

384

8*8*8

512

3 to 4

12

12*12

144

12*12*6

864

12*12*12

1728

3 to 6

20

20*20

400

20*20*6

2400

20*20*20

8000

3 to 10


Why the need for a transport system

Why the need for a transport system?

  • Diffusion is to slow for larger organisms where absorbing organs are located at a distance from the cells in need of food and oxygen

  • Hence larger organisms need a specialised transport system to deliver essential nutrients to living cells at a sufficiently rapid rate


Higher human biology

Artery


Higher human biology

Vein


Capillaries

Capillaries


Tissue fluid

Tissue Fluid

  • Blood is forced into narrow capillaries and undergoes a form of pressure filtration and much of the plasma is squeezed out through the thin walls. This liquid is called tissue fluid (same as blood plasma except it contains little or no protein)


The need to circulate blood

The need to circulate blood

To allow exchanges of materials between bloodstream and

  • external environment (e.g. absorption of oxygen and release of carbon dioxide at alveoli)

  • Internal environment (e.g. release of oxygen and removal of carbon dioxide at living cells)


Double circulatory system

Double circulatory system


The coronary artery

The coronary artery

  • The first two branches of the aorta


Heart problems

Heart Problems

  • Coronary heart disease

  • Atherosclereosis

  • Angina

  • How to avoid them –

  • Reduce cigarette smoking, stress, fat and cholesterol intake, ideal weight and regular exercise


  • Login