A cockroach has ten pairs of spiracles: two pairs in the thorax and eight pairs in the abdomen…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A cockroach has ten pairs of spiracles: two pairs in the thorax and eight pairs in the abdomen. It also has nine ganglia in its ventral nerve cord, three in the thorax and six in the abdomen.
- How many single spiracles are there in all?
- How many single spiracles are in the thorax?
- How many single spiracles are in the abdomen?
Need a reminder? The key ideaShow
The blood vascular system of the cockroach is open. The blood, called haemolymph, bathes the organs in the body space. A tubular heart with funnel shaped chambers and ostia pumps it forwards. The respiratory system is a network of tracheae that open through ten pairs of spiracles, two pairs in the thorax and eight in the abdomen. The tracheae branch into tracheoles that carry air to the cells. Malpighian tubules remove nitrogenous waste. The nervous system has a brain in the head and a ventral nerve cord with nine ganglia, three in the thorax and six in the abdomen. The sense organs are the antennae, the compound eyes, the palps and the anal cerci. The time for diffusion over a distance x is x squared divided by two times the diffusion constant.
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. pairs in the thorax and pairs in the abdomen.
Plan. Multiply the pairs by .
Step 1. Thorax. spiracles.
Step 2. Abdomen. spiracles.
Step 3. In all. spiracles, which is pairs.
Answer: ; ; .
Check. pairs times is .
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