Search our library of Human Biology questions

Top answers

Human Biology

All levels

What are the four chambers of the heart and what is the order blood flows through them?

The four chambers of the heart are the right atrium, right ventricle, left atrium and left ventricle.Deoxygenated blood (blood with no oxygen) flows into the right side of the heart via the superior and i...

Answered by Kirk C. • Human Biology tutor

8818 Views

Outline the events that occur within the heart, which cause blood to move around the body.

One of the most crucial functions of the heart is to act as a pump which distributes the blood around the body. The blood is first collected in the atria, and then pumped from atria to the ventricles. The...

Answered by Joanna K. • Human Biology tutor

4198 Views

Describe the main events that occur during human fertilization.

Fertilization is an example of a typical cell-to-cell recognition process between the small, assymetrical and motile sperm cell and the large, spherical, immobile egg. As soon as the sperm is released ins...

Answered by Danai Athina I. • Human Biology tutor

6275 Views

‘Smokers suffer from more lower respiratory tract infections.’ Justify this statement in light of respiratory tract protection mechanisms.

Smoke contains many harmful chemicals and carcinogens (such as polycyclic aromatic hydrocarbons). There are several ways in which smoking increases the likelihood of lower respiratory tract infections.

Answered by Ali K. • Human Biology tutor

2239 Views

Explain how oxygen and carbon dioxide are transported within the blood?

Oxygen diffuses through the alveolar wall into the capillary beds surrounding the lungs, and here it enters the red blood cells (erythrocytes). It binds to protein contained within the red blood cell call...

Answered by Dominic T. • Human Biology tutor

5851 Views