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Biology
Body Fluids and Circulation
83 questions from 38 papers, each with its answer.
- 83 questions
- 38 papers
- 2.35% of Biology
Hepatic portal system
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The hepatic portal vein drains blood to liver from
The hepatic portal vein brings blood from the intestine to the liver.
In the hepatic portal system, the hepatic portal vein carries the maximum amount of nutrients from the intestine to the liver.
Formed elements of blood – erythrocytes
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Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature? (a) They do not need to reproduce (b) They are somatic cells (c) They do not metabolize (d) All their internal space is available for oxygen transport
Loss of nucleus maximises space for haemoglobin.
In human RBCs, the nucleus degenerates during maturation, which provides more space for the oxygen-carrying pigment (haemoglobin). RBCs lack most cell organelles, including mitochondria, so they respire anaerobically (they do metabolise).
Myogenic heart
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Frog's heart when taken out of the body continues to beat for some time. Select the best option from the following statements (a) Frog is a poikilotherm (b) Frog does not have any coronary circulation (c) Heart is "myogenic" in nature (d) Heart is autoexcitable
A myogenic, autoexcitable heart beats without nervous input.
The frog (like other vertebrates) has a myogenic heart with a self-contractile system, i.e. it is autoexcitable; because of this it keeps working outside the body for some time.
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