Produces oil (1), to moisturise the skin (1) 12) Why do we have nerve endings in the skin? (1mark ) To sense temperature and pain (1) 13) What does the central nervous system consist of? (1 mark) Brain and spinal cord. 14) Name the 3 different types of nerves and their roles in the body (3 marks) Sensory nerve sends information from the receptor to the brain (1) – Motor nerve - sends information from the brain to the effector (muscles) (1) Relay nerve connects sensory nerves to motor nerves (1) – 15). Describe the pathway involved when the nervous system coordinates a response (6 marks) Stimulus receptor sensory nerve brain- motor nerve effector (muscle) response – – – – – 16) Describe the pathway of an uncoordinated response (reflex arc) (6 marks) Stimulus receptor sensory nerve RELAY NERVE- motor nerve effector (muscle) response – – – – – 17) What is the role of the myelin sheath on a neurone? (3 marks) Note: Do not say that it protects the neurone, you will not receive marks for this response. Electrical insulator (1), speeds up the electrical impulse (1), Stops the impulse getting lost. 18) A synapse can be found between the relay neurone and sensory and motor nerves. Describe how the impulse travels across a neurone. (4 marks) Presynaptic cell releases neurotransmitters (1), neurotransmitters diffuse across the synapse (1), the neurotransmitters bind to receptors on the post synaptic cell (1), an electrical impulse is triggered on the next neurone (1). 19) Compare the transmission of an impulse (how the impulse is carried) along an axon with transmission across a synapse (2 marks) Axon electrical impulse (1) – Synapse chemical impulse (1) – 20) Why is it an advantage for the axon to be long? (2 marks) Speeds up the impulse
Produces oil (1), to moisturise the skin (1) 12) Why do we have nerve endings in the skin? (1mark ) To sense temperature and pain (1) 13) What does the central nervous system consist of? (1 mark) Brain and spinal cord. 14) Name the 3 different types of nerves and their roles in the body (3 marks) Sensory nerve – sends information from the receptor to the brain (1) Motor nerve - sends information from the brain to the effector (muscles) (1) Relay nerve – connects sensory nerves to motor nerves (1) 15). Describe the pathway involved when the nervous system coordinates a response (6 marks) Stimulus – receptor – sensory nerve – brain- motor nerve – effector (muscle) – response 16) Describe the pathway of an uncoordinated response (reflex arc) (6 marks) Stimulus – receptor – sensory nerve – RELAY NERVE- motor nerve – effector (muscle) – response 17) What is the role of the myelin sheath on a neurone? (3 marks) Note: Do not say that it protects the neurone, you will not receive marks for this response. Electrical insulator (1), speeds up the electrical impulse (1), Stops the impulse getting lost. 18) A synapse can be found between the relay neurone and sensory and motor nerves. Describe how the impulse travels across a neurone. (4 marks) Presynaptic cell releases neurotransmitters (1), neurotransmitters diffuse across the synapse (1), the neurotransmitters bind to receptors on the post synaptic cell (1), an electrical impulse is triggered on the next neurone (1). 19) Compare the transmission of an impulse (how the impulse is carried) along an axon with transmission across a synapse (2 marks) Axon – electrical impulse (1) Synapse – chemical impulse (1) 20) Why is it an advantage for the axon to be long? (2 marks) Speeds up the impulse
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