Lung Function Flashcards
Breathing rate increases to get more oxygen into the blood. Gaseous exchange involves oxygen diffusing across membranes. Identify the membranes involved in this diffusion and name one characteristic that allows this process to happen. (2 marks)
The membranes involved in this diffusion is the alveoli membrane and the capillary membrane. These are very thin and have a very short diffusion pathway between them.
How is breathing rate regulated by the body to meet the increasing demands of exercise during a netball match? (4 marks)
More oxygen is needed for the working muscles. Chemo-receptors detect change in carbon dioxide and lactic acid, baroceptors detect change in blood pressure and proprioceptors detect change in movement. These then send a nerve impulse to the respiratory control centre which is in the medulla, in the brain, which then sends a nerve impulse to the phrenic nerve or intercostal nerve which sends a nerve impulse to the diaphragm and the intercostal muscles to increase or decrease breathing.
State 2 ways in which Carbon dioxide is transported in the blood ( 2 marks)
It is transported in the blood by dissolving in plasma and combining with haemoglobin.
Where is myoglobin found in the body and what is its role during exercise? (2 marks)
Myoglobin is found in skeletal muscles and it releases oxygen when there is a demand for it and there is low available.
