Explanation

White blood cells (leukocytes) are part of the immune system.

They play a key role in defending the body against infections, diseases, and foreign invaders.

They help maintain overall health.

Explanation

Explanation

The flu is caused by an influenza virus

Flu Risk Factors · chronic lung diseases such as asthma

ND2-03-2023

Explanation

Colour blindness is a genetically linked disease.

It typically inherited from one's parents and affecting the genes that code for colour vision.

Explanation

Tuberculosis is an infectious disease transmitted through the air when an infected person coughs, sneezes, or talks.

Explanation

The human hand has 27 bones:

the carpals or wrist accounts for 8

the metacarpals or palm contain five

the remaining fourteen are digital bones; fingers and thumb.

while 

The number of bones in a human skull is 22

300 bones are there in a newly born infant.

Explanation

Edward Jenner was a physician and scientist who pioneered the concept of vaccines including creating the smallpox vaccine, the world's first ever vaccine.

He belonged to the British.

Explanation

Typhoid and Cholera are both waterborne diseases that can be caused by drinking contaminated water.

• Typhoid fever is a bacterial infection caused by Salmonella Typhi, which can be spread through contaminated food and water.
• Cholera is a diarrheal disease caused by Vibrio cholerae, which can be spread through contaminated food and water, as well as through person-to-person contact.

Explanation

Polio, or poliomyelitis, is a disabling and life-threatening disease caused by the poliovirus.

The virus spreads from person to person

and can infect a person's spinal cord, causing paralysis (can't move parts of the body).

***

The Polio vaccine was invented by___?

 Jonas Salk

Which country launched a polio vaccine drive after 1988 in April 2022?

 Israel

Explanation

White blood cells (leukocytes) are part of the immune system.

They play a key role in defending the body against infections, diseases, and foreign invaders.

They help maintain overall health.