Chapter 10: Respiration

What is respiration?

It is a "chemical reaction" in cells which "releases energy" from nutrient molecules.

Define aerobic respiration?

It is the "chemical reaction" where food is broken down in the "presence of oxygen".

Define anaerobic respiration?

It is the "breakdown of food substances" in the "absence of oxygen".

Give equation for respiration.

Equation for respiration is:

Give use of aerobic respiration in human body.

Uses of energy in Body:

• "synthesis of protein

• building up of protoplasm for growth

• cell division

• heartbeat + muscle contraction

• absorption of food"

Give use of anaerobic respiration in human body.

Use of energy:
- it occurs in "muscles during exercise".

What are the advantages of breathing through nose?

Advantages of breathing through the nose:

• "dust, foreign particles are trapped" by the hair of nostrils

• as "air passes it is warmed and moistened" before it enters lungs