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Which of the following is an exchange vessel? A. Capillary B. Elastic artery C. Lymphatic D. Muscular artery E. Vein

A. Capillary
Answered by • Human Biology tutor
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Describe the role of the heart and lungs in the oxygenation of blood in humans. Why is oxygen is essential for the functioning of the human body.

The main purpose of oxygen in the body is for respiration. Respiration is a biochemical reaction, by which the body produces energy in the form of ATP to complete both cellular and other functions. This proc...
RH
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explain why a lack of thiamine (vitamin B1) causes a build up of lactate in cells

Thiamine is a co-enzyme for pyruvate dehydrogenase (PHD) the enzyme that converts pyruvate into acetyl-CoA at the start of the Krebs cycle, the 2nd stage of respiration. Without thiamine the activity of PHD ...
JO
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Describe what is meant by a chronic disease, and give an example.

A long-term health problem that requires ongoing management over a period of decades or years. It often cannot currently be cured , nor does it disappear, but is managed with medication or other therapies. E...
MB
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Outline the events that occur within the heart, which cause blood to move around the body.

One of the most crucial functions of the heart is to act as a pump which distributes the blood around the body. The blood is first collected in the atria, and then pumped from atria to the ventricles. The at...
JK
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