Biology Section 3.1

Question 1

Give an example of an organ that is found in:
Only one organ system

Answer 1

The heart is found only in the circulatory system

Question 2

Why is there no hierarchy of organization within single-celled organisms?

Answer 2

Single-celled organisms don’t have a hierarchy because they are made up of only one cell.

Question 3

Most animals have the same kinds of organ systems. Do you think there are tens, dozens, or even hundreds of completely different kinds of organ systems? Explain.

Answer 3

here are dozens of different kinds of organ systems, because most animals have the same basic needs like digestion, respiration, and circulation, but the exact organs and systems may vary slightly between species.

Question 4

Make a list of the main functions that must be performed by all living things. For each main function, name an organ system involved in performing that function.

Answer 4

Movement → Muscular system
Protection → Immune system
Respiration → Respiratory system
Digestion → Digestive system
Circulation → Circulatory system

Question 5

: What do groups of similar cells form?

Answer 5

Tissues

Question 6

What do different tissues combine to form?

Answer 6

Organs

Question 7

Give an example of an organ.

Answer 7

Brain. Heart , Stomach

Question 8

Name an example of an organ system.

Answer 8

Digestive system, circulatory system, respiratory system