Top answers

What specialised structures do the lungs have to allow diffusion of gases?

The lungs are highly specialised. They have alveoli which are small air sacs. Alveoli give the lungs a big surface area, meaning that more oxygen can diffuse from the lungs into the blood stream, and more wa...
BH
Answered by Bethany H. • Biology tutor
15094 Views

What is a cytoskeleton? What are its main components in animal cells?

A cytoskeleton is a structure that acts as a support for the cell. It also maintains the cell shape, holds and moves organelles. It is made from a fibre network dispered in the cell cytoplasm, attached in th...
BH
Answered by Bethany H. • Biology tutor
11152 Views

How does the body bring blood glucose concentration from a high level back to normal?

When blood glucose concentration rises above its optimum level of 90mg/100cm 3 , it is detected by β-cells in the Islets of Langerhans in the pancreas. These β-cells release insulin into the bloodstream. Ins...
EH
Answered by Emily H. • Biology tutor
5974 Views

What cells produce glucagon?

Alpha cells in the islets of Langerhans (pancreas)
LA
Answered by Lavin A. • Biology tutor
3126 Views

Why do foetuses have different haemoglobin to adults?

Normal adult haemoglobin is primarily comprised of 2 alpha and 2 beta subunits and foetal haemoglobin has 2 gamma subunits instead of the 2 betas. Now what this does is increase the binding affinity of this ...
MB
Answered by Max B. • Biology tutor
4176 Views