PSU Bio 161 Test 3 Questions and Answers Already Passed

PSU Bio 161 Test 3 Questions and Answers Already Passed 1. What is the function of a synapse? - a. to transmit electrical signals - b. to convert electrical signals into chemical signals - c. to store neurotransmitters - d. to regulate body temperature - Answer: b. to convert electrical signals into chemical signals Explanation: A synapse is the space between neurons where electrical signals are converted into chemical signals via neurotransmitters. 2. What is a neurotransmitter? - a. a type of hormone - b. a chemical messenger released at the end of a nerve cell - c. a type of enzyme - d. a component of the cell membrane - Answer: b. a chemical messenger released at the end of a nerve cell 2 Explanation: Neurotransmitters are chemical messengers released by neurons that transmit signals across the synapse to a postsynaptic cell. 3. What does the term "EPSP" refer to? - a. a type of brain scan - b. a membrane protein - c. excitatory postsynaptic potential, causing depolarization of postsynaptic neuron - d. a type of neurotransmitter - Answer: c. excitatory postsynaptic potential, causing depolarization of postsynaptic neuron Explanation: EPSP, or excitatory postsynaptic potential, refers to the depolarization of a postsynaptic neuron caused by excitatory neurotransmitters. 4. What is the function of the cerebrum? - a. regulates heartbeat and breathing - b. controls fine motor skills - c. responsible for voluntary muscular activity, vision, speech, memory, and thought 3 - d. integrates information from special senses and movement - Answer: c. responsible for voluntary muscular activity, vision, speech, taste, hearing, thought, and memory. Explanation: The cerebrum is the largest part of the brain and is responsible for various voluntary activities and sensory functions. 5. Where is the cerebellum located and what is its function? - a. located in the hindbrain, controls heartbeat and breathing - b. located in the forebrain, integrates sensory information - c. located in the midbrain, regulates fine motor skills - d. located at the rear of the brainstem, controls fine motor skills - Answer: d. located at the rear of the brainstem, a large structure of the hindbrain that controls fine motor skills. Explanation: The cerebellum, located at the rear of the brainstem, is responsible for coordinating fine motor movements and balance. 6. What are the components of the meninges of the brain? 4 - a. gray matter, white matter, and nuclei - b. neurons, glial cells, and axons - c. dura mater, arachnoid mater, pia mater - d. cerebrum, cerebellum, brainstem - Answer: c. dura mater, arachnoid mater, pia mater Explanation: The meninges are three layers