Respiration and Breathing

Objectives

Respiration!

Definition: the process by which energy is released from glucose Respiration Key Point

Equation for respiration Word equation: Glucose + Oxygen → Carbon dioxide + Water + ENERGY Chemical equation: C 6 H 12 O 6 + 6O 2 → 6CO 2 + 6H 2 O + ENERGY

1. Sit comfortably and put your hands on your belly. Breathe normally. ‘Feel’your breathing Try to feel if there are any changes in your belly.

1.(a)When I breathe in, my belly moves __________ (inwards / outwards) (b)When I breathe out, my belly moves __________. (inwards / outwards) outwards inwards

2.Cross your arms over your chest. Breathe deeply. Try to feel if there are any changes in your chest. 2.(a)When I breathe in, my chest moves __________ (upwards / downwards) and __________ (inwards / outwards). (b) When I breathe out, my chest moves __________(upwards / downwards) and _________(inwards / outwards). upwards outwards downwards inwards

1. Intercostal muscles

2. Diaphragm

Action of the intercostal muscles during breathing breathing outbreathing in intercostal muscles relax  ribs move downwards and inwards intercostal muscles contract  ribs move upwards and outwards

Action of the diaphragm during breathing breathing outbreathing in diaphragm moves upwards diaphragm moves downwards

breathing out intercostal muscles relax ribs move downwards and inwards volume inside the chest DECREASES gas pressure inside the chest INCREASES air is forced out of the lungs diaphragm moves upwards

breathing in intercostal muscles contract ribs move upwards and outwards volume inside the chest INCREASES gas pressure inside the chest DECREASES air is drawn into the lungs diaphragm moves downwards

Definition: the process by which air is repeatedly drawn into and out of the lungs Breathing Key Point

You should now…..

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