Human And Social Biology Paper 2 January 2022

by Powell

Improper method of disposal of domestic waste
Disposal of garbage in drains and gutters
Disposal of garbage in rivers and sea

Air Pollution
The open burning of waste causes air pollution or greenhouse affects. For example burning of rubber and plastic.

23 chromosomes in a sperm cell

There are 46 chromosomes in a human pancreas cell

Mitosis involves the division of body cells, while meiosis involves the division of sex cells. The division of a cell occurs once in mitosis but twice in meiosis. Two daughter cells are produced after mitosis and cytoplasmic division, while four daughter cells are produced after meiosis.

The most common cause of blocked fallopian tubes is PID. Pelvic inflammatory disease is the result of a sexually transmitted disease, although not all pelvic infections are related to STDs. Also, even if PID is no longer present, a history of PID or pelvic infection increases the risk of blocked tubes

Antigen is any substance that causes the body to make an immune response against that substance. Antigens include toxins, chemicals, bacteria, viruses, or other substances that come from outside the body.
A protein made by plasma cells (a type of white blood cell) in response to an antigen (a substance that causes the body to make a specific immune response).

Arteries carry blood away from the heart, and veins carry blood towards the heart. arteries carry oxygenated blood and veins carry deoxygenated blood.
Arteries have thick walls with muscle tissue. Veins have thinner walls and use valves to keep your blood flowing

Your heart is a single organ, but it acts as a double pump. The first pump carries oxygen-poor blood to your lungs, where it unloads carbon dioxide and picks up oxygen. It then delivers oxygen-rich blood back to your heart. The second pump delivers oxygen-rich blood to every part of your body.

During heavy rainfall, it is very common of many leaves, twigs, and other debris fall inside your gutters and clog up the waterways. These clog gutters collect plenty of water, which becomes favorite mosquito breeding places.

Keep the outdoor garbage bins covered
Remove stagnant water from flower pot plate or plant saucers
Use insect sprays and coils.

You may also like