Biology revision

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Created by: greta234
Created on: 13-10-15 17:09

What is the nervous System?

The network of nerve cells and fibres which transmits nerve impulses between parts of the body.

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what do neurons do when they are stimulated?

Transmit impulses

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What are axons surrounded by?

A fatty sheath

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What is a Synapse?

The gap between two neurons

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What is the pathway of a reflex arc?

Receptor - sensory neuron - spinal cord - motor neuron - effector

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How do drugs affect the nervous system?

They change the transmission of impulses across synapses

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What are the steps of the carbon cycle?

Plants take in CO2 > plants respire CO2 > Animals eat plants > carbon goes into animals fat & protein > CO2 return when animal respires > burning wood & fuels cause CO2

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what is carbon in the carbon cycle used for in plant bodies?

Carbohydrates, fats and proteins

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What is the word equation for photosynthesis?

carbon dioxide + water (+ light energy) → glucose + oxygen

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What are the limiting factors in photosynthesis?

light intensity, carbon dioxide concentration, temperature

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What is Tropism?

A tropism is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus.

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what is auxin?

a plant hormone which causes the elongation of cells in shoots and is involved in regulating plant growth.

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