Human Circulatory System

Q1

1. How does the human circulatory system work?

The human circulatory system is a network of arteries, veins, capillaries designed to provide essential minerals, nutrients, and other essential components to various parts of the body. It also collects metabolic waste to be filtered or expelled from the body.

Q2

2. What are the three types of circulation?

• Pulmonary Circulation
• Systemic Circulation
• Coronary Circulation

Q3

3. Is the human circulatory system open or closed?

The human circulatory system is a closed system that pumps blood through a network of arteries and veins. This type of circulation is seen in all vertebrates and some invertebrates.

Q4

4. What is the advantage of a closed circulatory system?

In a closed circulatory system, more pressure is available in the system, and the blood can reach the body extremities much quicker. This translates to a much faster metabolism rate and quicker movements in organisms with closed circulatory systems.

Q5

5. What is double circulation?

Double circulation is a system of circulation where the blood flows through the heart twice. This type of circulation is very effective as the body has a constant supply of oxygenated blood.

Q6

6. What are the dangers of high blood pressure?

High blood pressure can cause the inner walls of the arteries to get damaged. It can also cause arteries to become less elastic. Worst-case scenario, it can cause an aneurysm (a bulge in the artery that can potentially rupture).

Q7

7. What is a stroke?

A stroke is caused when brain cells do not get enough oxygen and blood supply. This causes the cells to die, resulting in symptoms such as numbness in the face, arms or a part of the body.

Q8

8. What is hypertension?

Hypertension is another term for high blood pressure. It occurs when the blood travels through the blood vessels with more force than normal. This can result in damage to the body. An average healthy human has a blood pressure of 120/80 Hg. Values higher than this is considered hypertension.

Q9

9. What is hypo-tension?

Also known as low blood pressure, hypotension is a condition where the blood flows through the blood vessels with unusually low pressure. On average, healthy blood pressure is considered to be between 120/80 Hg. Anything lower than this is considered as hypo-tension.

Q10

10. What was the earliest circulatory system like?

The circulatory system evolved as an efficient method to pump important nutrients and collect waste materials throughout the body. The earliest circulatory system resembled today’s open circulatory system where blood flowed in a hollow enclosed space. Closed circulation evolved much later in ancestors of vertebrates.