Biology research
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Transcript of Biology research
![Page 1: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/1.jpg)
Blood Vessels
![Page 2: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/2.jpg)
Artery
![Page 3: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/3.jpg)
Artery• tough on the outside and smooth on the inside
• has three layers:
1. an outer layer of tissue
2. a muscular middle
3. an inner layer of epithelial cells
![Page 4: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/4.jpg)
In the artery..• The muscle in the middle
1. Elastic
2. Very strong
• The inner layer
1. very smooth so that the blood can flow easily with no obstacles in its path
• The muscular wall of the artery
helps the heart pump the blood
![Page 5: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/5.jpg)
What happens in the artery?
• When the heart beats, the artery expands - it fills with blood
• When the heart relaxes, the artery contracts, exerting a force - strong enough to push the blood along
![Page 6: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/6.jpg)
Purpose of artery
• The arteries
1. deliver the oxygen-rich blood to the capillaries
2. the actual exchange of oxygen and carbon dioxide occurs
![Page 7: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/7.jpg)
Vein
![Page 8: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/8.jpg)
Vein
• Veins transport blood at a lower pressure
• Veins have three layers:
1. an outer layer of tissue
2. muscle in the middle
3. a smooth inner layer of epithelial cells
However, the layers are thinner, containing less tissue
![Page 9: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/9.jpg)
Purpose of vein..
• Veins receive blood from the capillaries after the exchange of oxygen and carbon dioxide has taken place
• The veins transport waste-rich blood back to the lungs and heart
• Waste-rich blood
1. keeps moving in the proper direction
2. not be allowed to flow backward
![Page 10: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/10.jpg)
Purpose of vein
• Valves that are located inside the veins
• The valves are like gates that only allow traffic to move in one direction
![Page 11: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/11.jpg)
Purpose of vein
• Vein valves
1. to keep blood flowing toward the heart
2. to allow blood to flow against the force of gravity.
![Page 12: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/12.jpg)
Purpose of vein
• Blood that is returning to the heart from the foot has to be able to flow up the leg.
• The vein valves
1. provide footholds for the blood as it climbs its way up.
![Page 13: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/13.jpg)
Capillary
![Page 14: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/14.jpg)
Capillary
• Capillaries
1. very thin
2. Fragile
3. one epithelial cell thick
4. blood cells can only pass through them in single file
![Page 15: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/15.jpg)
In the capillary..• Red blood cells inside the capillary
1. release their oxygen which passes through the wall
2. into the surrounding tissue
• The tissue releases its waste products (CO2 )
1. which passes through the wall
2. into the red blood cells.
![Page 16: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/16.jpg)
Purpose of capillary
1. Arteries pass their oxygen-rich blood to the capillaries
2. Capillaries then pass their waste-rich blood to the veins for transport
3. Back to the heart
![Page 17: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/17.jpg)
Purpose of capillary
• Capillaries are also involved in the body's release of excess heat
• For example, your body and blood temperature rises
• To help release this excess heat, the blood delivers the heat to the capillaries which then rapidly release it to the tissue
![Page 18: Biology research](https://reader034.fdocuments.us/reader034/viewer/2022052400/559f702f1a28ab05068b473b/html5/thumbnails/18.jpg)
Heart blood circulation
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