The respiratory centres of the medulla keep a person at rest breathing 16 times a minute…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The respiratory centres of the medulla keep a person at rest breathing times a minute. Each breath moves L of air, the usual tidal volume.
- How many breaths are there in an hour?
- How many breaths are there in a day?
- How many litres of air move in and out in a day?
Need a reminder? The key ideaShow
The midbrain has the cerebral aqueduct and the four corpora quadrigemina. The hindbrain has the pons (fibre tracts), the cerebellum (convoluted, many neurons) and the medulla (centres for respiration, cardiovascular reflexes and gastric secretions, joined to the spinal cord). NCERT says that the midbrain and the hindbrain form the brain stem.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Rate: a minute. Volume: L a breath.
Plan. Scale the rate to an hour, then to a day, then use the volume.
Step 1. In an hour. breaths.
Step 2. In a day. breaths.
Step 3. The air. L.
Answer: ; ; L.
Check. The medulla works without a break, even in sleep. You do not decide each of these breaths.
Watch out. The tidal volume is about L. Do not use the total lung capacity, which is much larger.
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