B1- Topic 2

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  • Created by: odionj01
  • Created on: 19-02-16 18:40
What is homeostasis?
Ability to maintain a stable internal enviroment
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Why is sweat produced when you are too hot?
when sweat evaporates, it transfers heat from skin to the surroundings, which cools you down.
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What is vasodilation?
This is where blood vessels move closer to the skin and dilate , this means more blood flow , transfer more heat
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Why do erector muscles contract when your too cold?
The hairs stand on end and trap insulating layers of air, to help keep you warm
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What is vasoconstriction?
blood vessels at surface constrict, less blood flow near surface, less heat transferred to surroundings.
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What are hormones?
They are chemical messengers sent in the blood, they are produced by the endocrine glands
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What is a target cell?
What a hormone affects because they have the right receptors to respond to the hormone
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What is a synapse?
the gap at which nuerotransmitters diffuse across.
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What is a dendron?
They are branched endings that connect with other nuerons
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what is a nueron?
a nerve cell
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What is an axon?
An electrical impulse thats passed along the cell
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What is a mylein sheath?
Acts as the electrical insulator,speeds up the electrical impulse
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What are the main five sense organs?
eyes,ears,nose,tounge
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What do sensory nuerones do?
carry nerve impulses from the receptors in sense organs to the CNS
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What do relay nuerones do?
carry nerve impulses from sensory nuerones to motor nuerones
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What do motor nuerones do?
carry nerve impulses from the CNS to the effectors
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What are effectors?
muscles or gland that respond to nerve impulses in different ways
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What does the CNS consist of?
the brain and the spinal cord
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What does the CNS do?
coordinates the response, decides what to do about the stimulus.
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What is the purpose of a reflex?
they help prevent injury
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What does the pancreas secrete when blood glucose is too high?
Insulin which turns glucose into glygogen
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What happens when insulin is secreted?
Blood glucose is reduced, insulin stops being secreted
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Why is glycogen useful?
Its insoluble so wont dissolve in the blood stream
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What does the pancreas secrete when blood glucose is too low?
glucagon
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What turns glucagon do?
makes liver turn glucagon into glucose
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How can type 1 diabetes be controlled?
avoiding foods rich in carbohydrates,injecting insulin
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Where is insulin injected?
subcataneous tissue
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What does resistancy to insulin?
body cells dont respond properly to the hormone insulin
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How would you work out BMI?
body mass divided by height squared
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How do plants respond to stimuli?
regulate their growth, by tropism
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What is phototropism?
the growth of a plant in response to light
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What is gravitropism?
the growth of plant in response to gravity
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What happens if a plants is positively gravitropic?
they grow downwards
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what is auxin?
a plant hormone that controls growth at tips of shots and roots.
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What happens if a plants is positively phototropic?
shoot tip exposed to light, more auxin accumulates the side with shade
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Other cards in this set

Card 2

Front

Why is sweat produced when you are too hot?

Back

when sweat evaporates, it transfers heat from skin to the surroundings, which cools you down.

Card 3

Front

What is vasodilation?

Back

Preview of the front of card 3

Card 4

Front

Why do erector muscles contract when your too cold?

Back

Preview of the front of card 4

Card 5

Front

What is vasoconstriction?

Back

Preview of the front of card 5
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