FACTORS AFFECTING RATE OF BREATHING IN HUMANS

Factors that cause a decrease or increase in energy demand directly affect rate of breathing.

1. Exercise, any muscular activity like digging.
2. Sickness
3. Emotions like anger, flight

Effects of Exercise on Rate of Breathing

1. Students to work in pairs.
2. One student stands still while the other counts (his/her) the number of breaths per minute.
3. The student whose breath has been taken runs on the sport vigorously for 10 minutes.
4. At the end of 10 minutes the number of breaths per minute is immediately counted and recorded.
5. It is noticed that the rate of breathing is much higher after exercise than at rest.

Dissection of a Small Mammal (Rabbit) to Show Respiratory Organs

1. The rabbit is placed in a bucket containing cotton wool which has been soaked in chloroform.
2. The bucket is covered tightly with a lid.
3. The dead rabbit is placed on the dissecting board ventral side upwards.
4. Pin the rabbit to the dissecting board by the legs.
5. Dissect the rabbit to expose the respiratory organs.
6. Ensure that you note the following features.
7. Ribs, intercostal muscles, diaphragm, lungs, bronchi, trachea, pleural membranes, thoracic cavity.

See also

GASEOUS EXCHANGE IN A MAMMAL – HUMAN

GASEOUS EXCHANGE IN AN AMPHIBIAN – FROG

GASEOUS EXCHANGE IN INSECTS

GASEOUS EXCHANGE IN ANIMALS

GASEOUS EXCHANGE IN PLANTS