Biology - B1

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  • Created by: hols_
  • Created on: 06-12-15 18:36
Why does Carbon monoxide take the place of oxygen in haemoglobin?
So the oxygen-carrying capacity of the blood is greatly reduced.
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Why is high blood pressure dangerous in the long-term?
Because the blood vessels can weaken & eventually burst - if a vessel bursts in the brain it may lead to brain damage or a stroke , in the kidneys it may lead to kidney damage.
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Low blood pressure...
Means the blood doesn't circulate efficiently, so some parts of the body are deprived of glucose & oxygen. this can lead to dizziness, fainting & cold hands & feet. Pressure may drop in the kidneys leading to kidney failure.
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Stimulants act on the synapses of the nervous system...
They cause more near-transmitters to cross the synapse - this speeds up the nervous impulses.
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Depressants act on the synapses of the nervous system...
They bind with receptor molecules in the membrane of the next neurone, blocking the transmission of the impulse - slows everything down.
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As an addict's body becomes more used to the drug...
It develops a high tolerance to it - the addict needs higher doses of the drug to get the same effects.
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Liver contains enzymes which break down alcohol but...
The products of breakdown are toxic & can cause liver damage - Cirrhosis of the liver is common among heavy drinkers.
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Smoking can lead to several diseases...
Cancer of the mouth, throat, oesophagus & lungs, heart disease, emphysema & bronchitis.
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Smoking damages the cilia which lines the airways...
This prevents the cilia from being able to remove the mucus, tar & dirt - leads to soccer cough as the body tries to cough up the mucus - excess coughing can damage the alveoli & cause emphysema.
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Cigarettes contain...
Nicotine, tar & carbon monoxide & particulates when burned.
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Why is carbon monoxide dangerous from a burning cigarette?
Since the blood picks it up instead of picking up oxygen - blood is carrying less oxygen - smokers feel breathless and can lead to heart disease.
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Tar contains?
Chemicals that are irritants & carcinogens & particulates in cigarette smoke accumulate in living tissue.
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What is homeostasis?
Your body has automatic control systems to maintain a constant internal environment to ensure that cells can function efficiently - it is the maintenance of a constant internal environment.
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Negative feedback involves...
The automatic reversal of a change in condition, occurs frequently in homeostasis.
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Other cards in this set

Card 2

Front

Because the blood vessels can weaken & eventually burst - if a vessel bursts in the brain it may lead to brain damage or a stroke , in the kidneys it may lead to kidney damage.

Back

Why is high blood pressure dangerous in the long-term?

Card 3

Front

Means the blood doesn't circulate efficiently, so some parts of the body are deprived of glucose & oxygen. this can lead to dizziness, fainting & cold hands & feet. Pressure may drop in the kidneys leading to kidney failure.

Back

Preview of the back of card 3

Card 4

Front

They cause more near-transmitters to cross the synapse - this speeds up the nervous impulses.

Back

Preview of the back of card 4

Card 5

Front

They bind with receptor molecules in the membrane of the next neurone, blocking the transmission of the impulse - slows everything down.

Back

Preview of the back of card 5
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