Biology
- #83 Question 6
The diagram below shows pressure changes in the left atrium and left ventricle of the heart and the aorta during the cardiac cycle. (a) Calculate how many heart beats there will be in one minute. (2 marks)(b) (i) On the diagram, indicate the point at...
- #50 The Gas Exchange System
All organisms take in gases from their environment and release gases to the environment. Animals take in O2 for aerobic respiration and release CO2. Plants also respire, but during daylight hours they photosynthesise at a greater rate than...
- #47 Summary Of The Mammalian Transport System
1. Blood is carried away from the heart in arteries, passes through tissues in capillaries, and is returned to the heart in veins. Blood pressure drops gradually as it passes along this system. 2. Arteries have thick, elastic walls, to allow them...
- #46 The Heart
The mammalian heart is a double pump: - The right side pumps deoxygenated blood at low pressure to the lungs. - The oxygenated blood then returns to the left side of the heart in the pulmonary vein.- The left side pumps oxygenated blood...
- Fetal Pig Anatomy Glossary ( I Suggest You Use Ctrl F)
Structure System Primary tissues Functions Pituitary Endocrine Glial cells, bundles of axons, cidophils, basophils and chromophobes cells Secretes hormones, assists other endocrine gland Medulla ...
Biology
Comparison between artery and vein
| Artery | Vein |
| 1. Direction of blood flow is from heart to other body parts | Direction of blood flow is from body parts to heart |
| 2. Carries oxygenated (pure) blood (except in pulmonary artery) | Carries deoxygenated (impure) blood (except in pulmonary vein) |
| 3. Blood flows in high pressure and speed | Blood flows in low pressure and speed |
| 4. Thicker and more elastic wall | Thinner and less elastic |
| 5. Narrow lumen | Wide lumen |
| 6. Deep seated in position | Generally found superficial in position |
| 7. Valves are absent | Present |
| 8. Tunica interna (innermost layer) is more developed and elastic. Elongated endothelial cells are present in this layer | Tunica interna is less developed and elastic. Endothelial cells are less flat |
| 9. Tunica media (middle layer) is more muscular with many elastic fibres | Tunica media is less muscular with few elastic fibres |
| 10. Tunica externa (outermost layer) is less developed so less strong | Tunica externa is more developed so more strong |
| 11. After death, arteries become empty | After death, veins will contain blood |
- #83 Question 6
The diagram below shows pressure changes in the left atrium and left ventricle of the heart and the aorta during the cardiac cycle. (a) Calculate how many heart beats there will be in one minute. (2 marks)(b) (i) On the diagram, indicate the point at...
- #50 The Gas Exchange System
All organisms take in gases from their environment and release gases to the environment. Animals take in O2 for aerobic respiration and release CO2. Plants also respire, but during daylight hours they photosynthesise at a greater rate than...
- #47 Summary Of The Mammalian Transport System
1. Blood is carried away from the heart in arteries, passes through tissues in capillaries, and is returned to the heart in veins. Blood pressure drops gradually as it passes along this system. 2. Arteries have thick, elastic walls, to allow them...
- #46 The Heart
The mammalian heart is a double pump: - The right side pumps deoxygenated blood at low pressure to the lungs. - The oxygenated blood then returns to the left side of the heart in the pulmonary vein.- The left side pumps oxygenated blood...
- Fetal Pig Anatomy Glossary ( I Suggest You Use Ctrl F)
Structure System Primary tissues Functions Pituitary Endocrine Glial cells, bundles of axons, cidophils, basophils and chromophobes cells Secretes hormones, assists other endocrine gland Medulla ...