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30 Cards in this Set
- Front
- Back
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What is homeostasis? |
Homeostasis is the body keeping an internal environment constantly within a tolerable range despite external environmental changes. |
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What are the 7 tolerable levels in humans? |
1. ions 2. blood pressure 3. blood glucose 4. temperature 5. water 6. pH of arterial blood 7. urea in plasma |
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What do plants have to regulate? |
- water balance - concentration of gases such as concentration of gases such as carbon dioxide and oxygen |
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What body systems regulate homeostasis? |
Endocrine System and Nervous System and behaviour |
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What does the nervous system do and what does the endocrine system spends to these changes? |
The nervous system detects change and endocrine system responds to these changes. |
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What is the role of the Nervous System |
- it is control system of the body - sends, receives and interprets information from body - monitors and coordinates internal responses and changes in the environment |
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What is the PNS and what does it do |
Peripheral Nervous system: |
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What are two major parts of the PNS |
- somatic nervous system: sends sensory info to CNS |
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What are nerves cells and what do they do? |
- basic functional unit of nervous system - sends electrical impulses to and from CNS and PNS and the effectors |
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Label the sectons and the things at the end. What sort of neuron is it and why? |
A) nucleus |
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Name the 3 types of neurons |
Motor |
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What does a motor neuron do |
Takes message from CNS to glands/muscles |
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What does a sensory neuron do |
receives message and sends to CNS
unipolar affector neuron |
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What does a inter neuron do |
Sends message around CNS |
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what is a reflex response |
A response you have no control over. Used to help save your life. Goes to spinal cord instead of brain and back to save time |
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What are neurotransmitters? |
brain chemicals that communicate information throughout brain and body. relay signals between nerve cells and neurons |
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Name the five parts of the stimulus response model in order |
stimulus |
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Name five sense organs |
smell touch hear see taste |
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what does a mechanoreceptor do |
detects things to do with pressure or disturbance |
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what does a thermoreceptor do |
detects temperature |
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what does a photoreceptor do |
detects light |
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what does a chemoreceptor do |
detects air and hormones |
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what is negative feedback? what is an example of negative feedback and temperature? |
Negative feedback is the counteracting of the stimulus. E.g. temperature increases therefore homeostasis occurs and temperature decreases |
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What does the endocrine system use and what does it do? |
The endocrine system uses chemical signals for cell to cell communication to coordinate function of cells. It is a long response and uses hormones which are long lasting |
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Where are hormones produced and why? |
Endocrine glands |
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How are hormones transported? What do they do? |
secreted directly into blood stream, transported through body via bloodstream. Acts on organs and tissues but are specific. Only a particular stimulus can trigger a particular set of hormones and only a particular cell will be triggered. |
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What are endocrine glands? What glands and other part of the CNS work together to maintain homeostasis? |
organs/tissues that excrete hormones pituitary, pineal gland, thalamus and hypothalamus are all closely connected. |
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What is the hypothalamus |
connectd to pituitary gland, produces hormones and controls release of some hormones from pituitary gland. |
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What hormone does the pituitary gland produce and what is it responsible for? |
growth hormone |
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Sum up homeostasis |
homeostasis is the act of balancing and if you cannot balancce then death will occur. It is maintained by negative feedback mechanisms as well as the endocrine system and nervous system |
