Chapter 31 - The Circulatory System

Question 1

What is an open circulatory system?

Answer 1

This is when the heart pumps blood into vessels that are open. Eg- Spiders

Question 2

What is a closed circulatory system?

Answer 2

This is when the blood remains in a continuous system of blood vessels. Eg- Humans

Question 3

What are the two advantages of a closed circulatory system?

Answer 3

1. Blood can be pumped faster, therefore nutrients can be delivered faster.
2. Blood flow rate can be different in different organs.

Question 4

What are the characteristics of an artery?

Answer 4

Carry blood away from heart
Small lumen
Large muscle/Elastic fibres
Endothelium
Under High Pressure
No valves

Question 5

What are the characteristics of a vein?

Answer 5

Carry blood to heart
Larger Lumen
Smaller muscle 
Endothelium 
Valves