What is the brain of a cockroach called, and where is it? …
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
- What is the brain of a cockroach called, and where is it?
- Which ganglion sends nerves to the mouth parts?
- How many ganglia lie in the thorax, and how many in the abdomen?
- Name three sense organs of the cockroach.
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.
Step 1. (a) The supra-oesophageal ganglion, in the head, above the oesophagus.
Step 2. (b) The sub-oesophageal ganglion, below the oesophagus.
Step 3. (c) Three in the thorax and six in the abdomen.
Step 4. (d) Any three of: the antennae, the compound eyes, the maxillary palps, the labial palps and the anal cerci.
Answer: (a) the supra-oesophageal ganglion; (b) the sub-oesophageal ganglion; (c) three and six; (d) for example antennae, compound eyes and anal cerci.
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