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What is the cardiac cycle?

The cardiac cycle is what happens during a single heartbeat.

To understand the cycle it helps to know that the heart is made up of four chambers, the top 2 chambers are called the atria a...

Answered by Megan P. • Biology tutor

4227 Views

How do white blood cells protect us from infection?

Sometimes microorganisms are able to make it past the body's external defences (i.e. the skin) the body's immune system must defend the body.

White blood cells are really important in the...

Answered by Thomas C. • Biology tutor

22711 Views

How do we regulate body temperature?

Homeostasis, the regulation of stable body conditions, includes control of body temperature. We function efficiently at 37 degrees celsius, as our proteins and enzymes work best at this temperature.

Answered by Sophie S. • Biology tutor

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Which best describes the function of a cell membrane? (a) It keeps the cell in shape. (b) It controls the substances entering and leaving the cell. (c) It controls the substances entering the cell. (d) It supports the cell structures.

This is an example of how you can get around not knowing an answer in a multiple choice question by using some basic knowledge and powers of deduction.

(a) "it keeps the cell in shap...

Answered by Rebecca W. • Biology tutor

13036 Views

What is active transport the movement of and what does it need to occur? Give some examples of where is might occur in the human body.

Active transport is another method by which molecules are transported into and out of the body. It is the movment of solutes that have been dissolved in water into and out of the cell against their con...

Answered by Martha K. • Biology tutor

7710 Views