24062566
Flashcards by Ishita Verma, updated 8 months ago
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Description
| Question | Answer |
| Stimulus | a change in the environment of an organism |
| The central nervous system is made up of.... | The brain and the spinal cord |
| Neuron | bundle of nerve cells |
| An Effector | any part of the body that produces a responce |
| Nerve Fibres | bundles of nerve cells that pass on electrical signal to the brain |
| Sensory neurones | carry impulses from receptors to the spinal cord |
| Relay neurons | carry impulses to and from the spinal cord |
| Motor neurons | carry impulses from the brain to the effector |
| Synape | is a junction between two neurons |
| neurotransmitters | molecules that are released as a chemical to diffuse across a synape |
| Reflex arc | When your body needs to react to something very quickly and sends the impulse through before it reaches the brain |
| In bright light eyes... | 1. radial muscles of the iris relax 2. circular muscles of the iris contract 3. recieve less light through contracted pupil |
| In dim light our eyes.. | 1. Radial muscles of iris contract 2. Circular muscles of iris relax 3. Receive more light through dilated pupil |
| calliary muscles | pull lens for focusing |
| cornea | lets light into eye and focuses |
| iris | controls the amount of light entering eye |
| lens | focuses light onto the retina |
| optic nerve | sends signals to the brain |
| pupil | lets light enter through the lens |
| retina | light sensitiv layer that sends signals to the optic nerve |
| suspensory ligaments | hold lens in place |
| Hormones (in people) | are chemical messengers that co-ordinate systems in the body |
| What are the two types of glands found in the body | endocrine and exocrine glands |
| Pituitary Gland | is linked by nerves to the hypothalumos in the brain and produces many hormones |
| The pancreas | is both an endocrine and an exocrine gland wich reguate blood |
| What happens when adrenaline is released into the body? | -pupil dilate -breathing becomes faster and deeper -heart beats faster -hair stands on end -glucose is released from liver -blood is directed away from gut towards liver |
| Homeostasis | is the maintenance of a constant internal environment |
| What does the body do in response to a sudden increase in temperature? | -Sweating -Vascodilation |
| What does the body do in response to a sudden decrease in temperature? | -Shivering -Hair stands on end -Vascoconstriction |