Top answers

Through which chambers and valves does the blood flow in the human heart?

Blood enters the heart from the body through a large vein called the Vena Cava. This blood flows freely into the right side of the heart into the right Atrium. From here the blood will pass through the Tricu...
NE
3755 Views

Resistance to antibiotics is caused by a mutation. What is a mutation?

A change in the DNA base sequence resulting in a different protein structure.
EB
4804 Views

Explain why in the heart the wall of the left ventricle is thicker than the wall of the right ventricle?

This is because the left ventricle pumps oxygenated blood round the entire body while the right ventricle only pumps blood to the lungs which is a much shorter distance. Because the left ventricle needs to p...
KD
222237 Views

How do female reproductive hormones work to ensure survival of a zygote in the luteal stage of the menstrual cycle

The two main gonadotrophins in females are FSH (follcile stimulating hormone) and LH (luteinising hormone). FSH is primarily responsible for the recruitment and growth of follicles in the ovary during the fo...
AF
3920 Views

Why don't antibiotics work against viruses?

Antibiotics are a class of drugs which were discovered to be effective against bacterial infections, strictly speaking, they are called antibacterial chemotherapeutics; meaning they are drugs which selective...
TC
14478 Views