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What is a hormone?

A hormone is a chemical messenger. It is produced by a gland and then travels in the blood to a specific target organ where it causes a response, changing the way the body functions. Hormones can be protein ...
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Answered by Emily A. • Biology tutor
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What are the products of respiration?

Energy in the form of ATP, which is used to fuel chemical reactions in our body as well as many other processes. Waste products: Carbon dioxide and water.
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Answered by Cristina O. • Biology tutor
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What is a synapse?

A synapse is the tiny gap between two neurones. At a synapse information is passed across the gap via chemicals, called neurotransmitters, rather than using electrical impulses. When information passes acros...
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Answered by Emma C. • Biology tutor
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Describe how the structure of alveoli in the lungs enables efficient oxygen supply during aerobic respiration?

The alveoli are sac like structures which have a large surface area to volume ratio allowing for fast diffusion of oxygen into the blood (Fick's law). This large SA:V ratio is generated because the alveoli h...
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Answered by Philip B. • Biology tutor
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What features of the nephron allow ultrafiltration to take place in the kidneys?

The glomerulus is a knot of cappilaries inside the Bowman's capsule. The afferent arteriole (small blood vessel leading into the glomerulus) has a much larger diameter than the efferent arteriole (small bloo...
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Answered by Laura E. • Biology tutor
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