Top answers

Explain the formation of an action potential in a neuron

Firstly, depolarization of the neuronal membrane occurs. This is due to a stimulus which causes voltage-gated sodium ion channels to open, allowing sodium ions to diffuse down their concentration gradient in...
SM
Answered by Sophie M. • Biology tutor
3992 Views

Describe the ways in which the pancreas acts as both an endocrine and exocrine gland

The Endocrine part of the Pancreas is the Islets of Langerhans which contain alpha and beta cells. These cells secrete hormones directly into the blood. The alpha cells secrete glucagon and the beta cells se...
ES
Answered by Esther S. • Biology tutor
7455 Views

Explain the way in which blood moves throughout the heart, including nodes and valves.

First, the blood enters through the right and left atria. The atrioventricular valves are closed, so the blood pools up inside them. Then, the sinoatrial node (SAN) sends a pulse for the atria to contract, f...
NR
Answered by Nicole R. • Biology tutor
2280 Views

How do you plan an essay within an A level exam?

Approaching unseen essay questions, and planning essays within the exam time constraints, can seem really intimidating. However having a sturdy planning method will allow you to attack any question with conf...
JD
4939 Views

How do you analyse a film poster?

Firstly I would teach students the difference between denotation and connotation- denotation being the physical contents of the poster, (colour, composition, text etc. ), connotation being the assumptions or...
LN
Answered by Lia N. • Media Studies tutor
6041 Views