Chemistry for Biologists

Nerves and hormones

1. Both the nervous and endocrine systems:
use chemicals to help the body grow
use chemicals to transmit messages
use water to make them visible
are water soluble
2. The over stimulation of nervous tissue by nicotine:
promotes growth
protects the body from serious illness
helps to repair nerve cells
causes nerve damage
3. Nicotine mimics the action of:
other chemicals
cytoplasm
neurotransmitters
other hydrocarbons
4. The neurotransmitter is broken down by a chemical process called:
precipitation
reduction
hydrolysis
oxidation
5. Stimulation of the presynaptic membrane causes a change in its electrical
calcium ions to flow out
sodium ions to flow in
sodium ions to flow out
calcium ions to flow in
6. The neurotransmitter found in synaptic vesicles is called:
acetylchlorine
acetylcholine
acetic acid
acetylene
7. Ion transfer reactions:
only happens in lower life forms
only happens at the ends of the neurone
are a wave of reactions that move alone the length of the axon
only happen where the nerve is stimulated
8. When the cell membrane is depolarised its permeability:
only allows water molecules out
alters to allow chlorine ions in
alters to allow to let sodium ions in
stays the same
9. The axon is:
an extension of the cell cytoplasm
very long dendrons
a hollow tube
just the cell membrane
10. Nerve cells are also known as:
impulses
neurones
cytoplasm
nucleus

 

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