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Biology
A Level

What is the process of the heart pumping?

There are 4 chambers of the heart; 2 atria (upper chambers) and 2 ventricles (lower chambers). Blood flows from the vein into the atrium, and when the pressure of the atrium is higher than the pressure of...

Answered by Biology tutor
1894 Views

What are sinusoids?

A specially adapted capillary which connects the hepatic vein to the hepatic portal vein and hepatic artery within the liver lobule.

Answered by Oli K. Biology tutor
4246 Views

Describe the action of insulin for the control of blood glucose concentration

Insulin is made in the beta cells of the pancreas. They act on receptors on the target cells. This controls the uptake of glucose in the target cells by regulating the inclusion of channel proteins on the...

Answered by Biology tutor
1996 Views

What is the founder effect? How can it influence the genetic profile of a population?

The founder effect occurs when a small number of individuals moves away from the main population, populate a new area, and found a new population. Two notable effects on the genetic profile of a ...

Answered by Leonie R. Biology tutor
7786 Views

What happens to DNA during mitosis?

ProphaseThe chromatin wraps around the histones to become condensed. This is where the chromosomes first become visible.MetaphaseThe chromosomes line up on the equator of the cell and the sp...

Answered by Biology tutor
1920 Views

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