C = /6 QUIZ - NERVOUS SYSTEM Year 5 MYP - 9th Grade Biology Name: ______________________________________ Date: _______________ 1. The movement of which ion initiates an action potential? A. Calcium B. Magnesium C. Sodium D. Potassium (1) 2. In a nerve impulse, what happens at the site following the highest point of the action potential? A. Voltage-gated sodium ion channels open and Na+ is pumped in. B. Voltage-gated sodium ion channels open and Na+ diffuses out. C. Voltage-gated potassium ion channels open and K+ is pumped out. D. Voltage-gated potassium ion channels open and K+ diffuses out. (1) 3. What is the role of active transport in the transmission of nerve impulses by neurones? A. Propagates an action potential by pumping sodium ions across the membrane out of the neurone. B. Propagates an action potential by pumping sodium ions across the membrane into the neurone. C. Initiates the action potential needed for the transmission of an impulse by pumping calcium ions out of the endoplasmic reticulum. D. Establishes the resting potential needed for the transmission of an impulse by pumping sodium and potassium ions across the membrane. (1) 4. Which division describes the central nervous system? A. Peripheral and central B. Voluntary and involuntary nerves C. Brain and spinal cord D. Sensory and motor nerves (1) 5. Which structure is responsible for passing messages directly to effector organs? (1) A. B. C. D. 6. State the type of neuron that carries an impulse to a muscle. ..............MOTOR NEURON......................................... (1) 7. Identify the labelled parts in the following diagram of two neurons. Presynaptic neuron X X X X X I .......................... X X X X X X Receptor (for neurotransmitter) II .......................... (2) 8. State which is the portion of the nervous system that is considered involuntary. ...........AUTONOMIC NERVOUS SYSTEM…................... (1) 9. What substance enters the presynaptic neuron during synaptic transmission and what substance leaves it? Substance entering presynaptic neuron Substance leaving presynaptic neuron A. Neurotransmitter Calcium ions (Ca2+) B. Neurotransmitter Sodium ions (Na+) C. Neurotransmitter Sodium ions (Na+) 2+ D. (1) Neurotransmitter Calcium ions (Ca )