Question

1. why do myelinated axons conduct impulses faster?

a. they are closer to the brain
b. they store more ions
c. they block sodium
d. impulses jump between nodes

1. what is the role of neurotransmitters?

a. carry oxygen
b. block pain
c. insulate axons
d. jump the synaptic gap

1. a nerve is best described as

a. a single neuron
b. a brain cell
c. a muscle fiber
d. a bundle of nerve fibers held together by connective tissue

1. nerves that carry impulses into the cns are

a. motor nerves
b. mixed nerves
c. reflex nerves
d. sensory nerves

1. nerves that carry impulses to muscles are

a. sensory nerves
b. interneurons
c. mixed nerves
d. motor nerves

1. nerves with both sensory and motor fibers are

a. reflex nerves
b. cranial nerves
c. autonomic nerves
d. mixed nerves

1. reflex arcs involve signals sent to the

a. brain only
b. muscle only
c. heart
d. spinal cord

1. reflexes are

a. learned
b. voluntary
c. slow and uncoordinated
d. automatic and unconscious

1. which is an example of a reflex?

a. yawning
b. walking
c. sneezing
d. sneezing

1. the knee - jerk reflex involves tapping the

a. achilles tendon
b. quadriceps muscle
c. femur
d. patellar ligament

1. pulling away from pain is the

a. stretch reflex
b. knee - jerk reflex
c. cranial reflex
d. withdrawal reflex

1. doctors test reflexes to determine

a. muscle strength only
b. heart efficiency
c. lung capacity
d. nerve function

1. anesthesiologists use reflexes to check

a. pain tolerance
b. blood pressure
c. muscle mass
d. drug effectiveness

1. protective membranes of the cns are the

a. myelin
b. ligaments
c. synapses
d. meninges

1. how many meninges layers are there?

a. one
b. two
c. four
d. three

Explanation:

trigger action.

1. Mixed nerves contain both sensory (input) and motor (output) fibers to handle two-way signals.
2. Most reflex arcs send signals to the spinal cord first for rapid, involuntary response, bypassing the brain initially.
3. Reflexes are involuntary, automatic responses to stimuli, requiring no conscious thought.
4. Sneezing is an autonomic reflex triggered by irritants in the nasal passages; the others are voluntary actions.
5. The knee-jerk reflex tests stretch of the quadriceps tendon, which connects to the patellar ligament (patellar reflex).
6. Pulling away from pain is a withdrawal reflex, a protective response to harmful stimuli.
7. Reflex tests assess the integrity of nerve pathways, so they primarily check nerve function.
8. Anesthesiologists use reflexes to monitor how well anesthesia (drugs) is suppressing neural activity.
9. The meninges are the three protective membranes surrounding the CNS (brain and spinal cord).
10. The three meningeal layers are the dura mater, arachnoid mater, and pia mater.

Answer:

trigger action.

1. Mixed nerves contain both sensory (input) and motor (output) fibers to handle two-way signals.
2. Most reflex arcs send signals to the spinal cord first for rapid, involuntary response, bypassing the brain initially.
3. Reflexes are involuntary, automatic responses to stimuli, requiring no conscious thought.
4. Sneezing is an autonomic reflex triggered by irritants in the nasal passages; the others are voluntary actions.
5. The knee-jerk reflex tests stretch of the quadriceps tendon, which connects to the patellar ligament (patellar reflex).
6. Pulling away from pain is a withdrawal reflex, a protective response to harmful stimuli.
7. Reflex tests assess the integrity of nerve pathways, so they primarily check nerve function.
8. Anesthesiologists use reflexes to monitor how well anesthesia (drugs) is suppressing neural activity.
9. The meninges are the three protective membranes surrounding the CNS (brain and spinal cord).
10. The three meningeal layers are the dura mater, arachnoid mater, and pia mater.