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| Another name for a nerve cell |
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| What is the central nervous system |
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| The spine and brain only. The peripheral nervous system is what branches off of that. |
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| A sheath that covers the axon and makes nerve impulses travel around them faster. They act as protection and insulation for an axon. |
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| Where do axons not have myelin sheath? |
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Definition
| In the brain and other areas. |
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Definition
| Vesicles have a neuro transmitter that allows itself to go to the end of a neuron and cross a gap at the end of the neuron and carries onto to either a dendrite, muscle or a gland. |
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| Something occuring in or on the body that is of a negative effect to our body. Negative feedback will make us carry out a response that will reduce the stimulus (thing wrong with our body) |
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| Lets us carry out a response to increase a stimulus. |
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| Is negative feedback essential to maintain homeostasis? T/F |
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| Do not travel to the brain but just to the spinal cord and straight back. This is because it is quicker and more immediate to prevent damage. It is used to be quicker and protect your body. |
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| What is the function of a nerve cell? |
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Definition
| To conduct a nerve impulse. |
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Definition
| Do not travel to the brain but just to the spinal cord and straight back. This is because it is quicker and more immediate to prevent damage. It is used to be quicker and protect your body. |
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| Nerve cells cannot be replaced or repaired. T/F |
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Definition
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| If a direct nerve path is damaged... |
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Definition
| then an alternative route may be sort out. |
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Definition
| Extensions of a neuron that receive messages from other cells / neurons. |
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Definition
| Only in one direction from the dendrite end to the axon end. |
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| What are the two systems that send messages across our body. |
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Definition
| Nervous System and the endocrine system |
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| Transports messages through hormones that spread all across your body. |
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| Are chemicals produced and taken through the blood stream and travel around the body. |
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| What is the problem with hormones and the advantage with nerves? |
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Definition
| Hormones have to go all over the body rather than one specific point. Nervous system messages go to one specific point of the body and are therefore much quicker. Better if serious damage is happening to the body and immediate action needs to be taken. |
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| Which responses last longer. Hormone or nerves? |
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Definition
| Hormone responses last longer than nervous system responses. |
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| What is the only very fast hormone |
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Definition
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| What are the two main cells in the nervous system? |
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| The actual nerve cell that is the conducting cell that transmits impulses and is the structural unit of the nervous system. |
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Non conductive
And a support system for neurons |
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| What are the three types of nerves |
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Definition
Sensory (Afferent) that travel towards the central nervous system and convert stimuli into internal electrical impulses.
Motor (Efferent) are away from the CNS and can use muscle fibres to cause muscle contractions.
Interneurons are found between the sensory and motor neurons and most are found in the CNS. |
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Term
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Definition
Cell body containing nucleus
Dendrites that project from the cell body and branch to receive signals from other neuorns and transmit impulses to the cell body
Axon |
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Term
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Definition
| One projects from each cell body and is elongated and takes messages away from the cell body in one direction only and connect to other neurons, muscles or glands. |
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| Internal environment includes |
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Transmission of messages within the nervous system.
a) Relies on active transport of neurotransmitter
b) involves both electrical impulses and chemical messengers |
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Definition
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| both systems nervous and endocrine |
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Definition
| release chemical signals that act on tissues they control |
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| Why do hormone responses last longer? |
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Definition
| Because hormones remain in the bloodstream for some time before being destroyed. |
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