The human circulatory system | Starter Quiz | Oak National Academy

Which best describes living organisms?

• they contain cells

• they are made of cells

Answer explanation

Living organisms are made of cells.

Tags

NGSS.MS-LS1-1

What is an organ?

• A group of similar cells.

• A group of organs.

• A group of different cells.

• A group of different tissues.

Answer explanation

Organs are made of different tissues. These different tissues allow an organ to carry out its function(s). For example, the heart is made of muscle tissue and connective tissue.

What is blood transported around the body in?

Answer explanation

Blood moves around the body in blood vessels. There are different types of blood vessels, arteries, veins and capillaries.

Which two gases are exchanged in the lungs?

• oxygen and nitrogen

• oxygen and carbon monoxide

• carbon dioxide and nitrogen

• carbon dioxide and oxygen

Answer explanation

Oxygen from the air is need for respiration and carbon dioxide is released as a waste product.

What is the word summary of respiration?

• water + oxygen → carbon dioxide + glucose

• oxygen + glucose → carbon dioxide + water

• carbon dioxide + glucose → oxygen + water

• water + carbon dioxide → glucose + oxygen

Answer explanation

The word summary oxygen + glucose → carbon dioxide + water can be used to summarise the reactions of respiration. Respiration provides energy for life processes.

What gas do red blood cells transport?

Answer explanation

Oxygen diffuses into blood at the lungs and is transported to cells where it is needed for respiration.