FACTORS AFFECTING RATE OF BREATHING IN HUMANS

Biology

FACTORS AFFECTING RATE OF BREATHING IN HUMANS

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

  • Exercise, any muscular activity like digging.
  • Sickness
  • Emotions like anger, flight

Effects of Exercise on Rate of Breathing

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

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

  • The rabbit is placed in a bucket containing cotton wool which has been soaked in chloroform.
  • The bucket is covered tightly with a lid.
  • The dead rabbit is placed on the dissecting board ventral side upwards.
  • Pin the rabbit to the dissecting board by the legs.
  • Dissect the rabbit to expose the respiratory organs.
  • Ensure that you note the following features.
  • 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

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