Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
9 Homeostasis
| Term | Definition |
|---|---|
| Effectors | muscles or glands that put the messages into effect |
| Homeostasis | the process of maintaining a constant internal Environment |
| Receptors | special cells that detect stimuli |
| Stimulus | any factor that stimulates a receptor and brings about a response |
| Negative feedback | a response that reduces the original stimulus |
| Positive feedback | a response that amplifies the output to a stimulus |
| Dendrite | branches from the cell body that receive messages from other neurons |
| Nucleus | roundish structure inside a cell that acts as the control centre for the cell |
| Cell body | the part of the neuron that contains the nucleus |
| Axon | a nerve fibre that sends nerve impulses away from the cell body |
| Myelin Sheath | the insulating layer that covers a neuron |
| Schwann cell | Cells that produce myelin |
| Node of Ranvier | A gap in the myelin sheath to increase speed of impulse |
| Axon terminals | Axon ending that connect to an effector or another neuron |
| Neuron | A nerve cell |
| Central nervous system (CNS) | the brain and the spinal cord |
| Peripheral nervous system (PNS) | the nerves that carry messages to and from the central nervous system and other parts of the body |
| Nerve impulse | the electrical message carried by a nerve cell |
| Motor neurons | nerve cells that carry messages from the CNS to effectors |
| Sensory neurons | nerve cells that carry messages from cells in the sense organs to the CNS |
| Interneurons | nerve cell that transfer signals between sensory and motor neurons |
| neurotransmitters | chemicals released by axon terminals into the synapse that are detected by neighbouring neurons. |
| Reflex | quick, automatic actions that protect the body from danger; they are also known as reflexes |
| Somatic nervous system | part of the nervous system that coordinates the movement of the body and receives information from the sensory organs |
| Autonomic nervous system | the system controlling involuntary actions such as the heartbeat |
| Parasympathetic nervous system | part of the nervous system that slows the body down and controls it when it is resting. Rest and Digest |
| Sympathetic nervous system | part of the nervous system that speeds up the functions of the body and makes the body work more efficiently. Fight or Flight |
| Hormones | chemical substances that act as messengers in the body |
| Endocrine glands | glands that produce hormones |
| Target cells | the cells on which a hormone acts |
Created by:
Bsutton22
Popular Biology sets