B8. Gas exchange and Respiration

 (0654) Coordinated Sciences 2023/2024

Subheadings and Key concepts

B8.1. Gas exchange

• gas exchange surfaces
• inspired vs expired air
• protecting the respiratory system
• effects of exercise on breathing
• tobacco smoking

B8.2. Respiration

• aerobic respiration
• anaerobic respiration in
• muscles
• yeast

08. Respiration pdf

#85 Summary of Respiration

Credit: acsbiology.info

Respiration is a series of metabolic reactions that takes place in every living cell. The purpose of respiration is to release energy from glucose, so that the cell can make use of the energy.

#84 Ventilation, role of intercostal muscles and diaphragm

There are 2 sets of muscles which help you to breath:

- intercostal: between the ribs

- diaphragm: a large sheet of muscle and elastic tissue, underneath the lungs and heart. 

#83 Effects of tobacco smoke on the respiratory system

Tobacco smoke contains irritants and carcinogens. 

Its 4 main toxic chemicals: carbon monoxide, nicotine, smoke particles and tar.

#82 Inspired and expired air, blood pH and breath rate

* inspired air: air we breath in

* expired air: air we breath out

#81 Gaseous exchange, role of mucus and cilia

Gas exchange usually involves 2 or more gases transferred in opposite directions across a respiratory surface.

#80 Aerobic and anaerobic respiration

Respiration releases energy from food.

There are 2 kinds of respiration: Aerobic and Anearobic. The main difference between them is that aerobic respiration involves oxygen and anaerobic respiration does not!

# 79 Respiration realeases energy from food

Respiration is the chemical reactions that break down  nutrient molecules in living cells to release energy.