Top answers

Biology
A Level

Can you explain the main events that happen during an action potential?

What is an action potential? When a stimulus of sufficient size is detected, it causes a temporary reversal of charges either side of the axon membrane. It also causes the channels in the axon memb...

DN
Answered by Dominique N. Biology tutor
3007 Views

Describe how the body maintains control of blood glucose

If the concentration of glucose in the blood is too high, this is detected by beta cells in the pancreatic islets, which release the hormone insulin. Insulin has several ...

MB
Answered by Michael B. Biology tutor
2720 Views

Explain the nerve cell events that are propagated by each nerve cell to lead to a cough being stimulated by the brain.

Once an irritating particle enters the trachea and stimulates a receptor a series of events take place. The resting membrane potential of a sensory neuron (usually mainta...

AR
Answered by Alicja R. Biology tutor
2522 Views

How might antihypertensive drugs lower the risk of developing atherosclerosis?

Recap: Atherosclerosis is a disease where damage to the endothelium causes LDL (bad) cholesterol deposits to accumulate in the damaged section of endothelial wall. As part of the b...

DR
Answered by Daniel R. Biology tutor
5271 Views

Describe the control of the menstrual cycle by the hormones FSH, LH, Oestrogen and Progesterone, in the situation where the person does not become pregnant. You may use a diagram to show how their levels change throughout the cycle.

Day 1-5: FSH is released from the pituitary gland and stimulates the primary oocytes to complete meiosis 1 and mature. The primary oocyte is inside a primary follicle which matures into a Graafian follicl...

UD
Answered by Udita D. Biology tutor
3687 Views

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