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Biology
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Oxygen is exchanged between the blood capillaries and the tissues. Give two ways in which capillaries are adapted for exchanging blood with the tissues.

  1. Thin walls for short diffusion path 2. Narrow, so have a large surface area to volume ratio 
LG
Answered by Leila G. Biology tutor
4349 Views

What endocrine glands regulate sexual activity in males? How does this regulation work and what hormones are involved?

Here are the endocrine glands that regulate sexual activity in males: 1) the hypophysis (aka. the pituitary); 2) the adrenal glands; 3) the gonad...

LT
Answered by Lydia T. Biology tutor
6681 Views

Explain the process of translation

In short, translation is the synthesis of proteins by ribosomes in the cell. It follows after the process of transcription in which a molecule of mRNA is copied from DNA to produce a specific base sequenc...

JH
Answered by James H. Biology tutor
17858 Views

During the cardiac cycle , there is a delay between the excitation of the atria and excitation of the ventricles. Explain how this is achieved and why this delay is essential.

Excitation from SAN (sino-atrial node) spreads across atria, causing them to contract first. The excitation is conducted to the AV (atri...

JE
Answered by Jane E. Biology tutor
13599 Views

Describe how a synapse works

 - An electrical impulse travels down the axon of a pre-synaptic neurone. - The movement of this electrical impulse initiates the release of chemical messengers which are...

SI
Answered by Saira I. Biology tutor
2870 Views

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