BIOL 251 MODULE 7 EXAM: PNS, ANS & SPECIAL SENSES | EYE/EAR ANATOMY & AUTONOMIC REFLEXES MODULE 7: NERVOUS SYSTEM II & SPECIAL SENSES QUESTIONS AND ANSWERS | INSTANT PDF DOWNLOAD

BIOL 251 MODULE 7 EXAM: PNS, ANS & SPECIAL SENSES | EYE/EAR
ANATOMY & AUTONOMIC REFLEXES MODULE 7: NERVOUS SYSTEM II &
SPECIAL SENSES QUESTIONS AND ANSWERS | INSTANT PDF
DOWNLOAD

Part 1: The Peripheral Nervous System & Reflexes
1. Which type of receptor responds specifically to pain-causing stimuli like
extreme heat or inflammatory chemicals?
 A) Mechanoreceptors

 B) Photoreceptors

 C) Nociceptors

 D) Chemoreceptors

Explanation: Nociceptors are specialized free nerve endings that signal actual or
potential tissue damage.
2. "Proprioceptors" provide information about which of the following?
 A) Light intensity

 B) Body position and movement (found in muscles and joints)

 C) Blood pressure

 D) Odors

Explanation: Proprioceptors monitor the stretch in skeletal muscles, tendons, and joint
capsules to inform the brain of our body's location in space.
3. Which nerve of the Brachial Plexus is often compressed in "Carpal Tunnel
Syndrome"?
 A) Radial nerve

 B) Ulnar nerve

 C) Median nerve

 D) Axillary nerve

, Explanation: The Median nerve passes through the carpal tunnel; compression leads
to numbness in the thumb and first two fingers.
4. The "Phrenic Nerve," which innervates the diaphragm, arises from which
plexus?
 A) Cervical Plexus (C3-C5)

 B) Brachial Plexus

 C) Lumbar Plexus

 D) Sacral Plexus

Explanation: A common medical mnemonic is "C3, 4, 5 keep the diaphragm alive."
5. What is the correct order of a "Reflex Arc" from start to finish?
 A) Receptor → Effector → Integration → Sensory Neuron → Motor Neuron

 B) Receptor → Sensory Neuron → Integration Center → Motor Neuron → Effector

 C) Motor Neuron → Sensory Neuron → Receptor → Integration → Effector

 D) Effector → Motor Neuron → Integration → Sensory Neuron → Receptor

Explanation: The Reflex Arc is a fast, involuntary pathway that bypasses the conscious
brain for immediate response.
6. Which reflex prevents a muscle from over-stretching by causing it to contract?
 A) Tendon reflex

 B) Stretch reflex (e.g., Patellar reflex)

 C) Flexor reflex

 D) Crossed-extensor reflex

Explanation: The Stretch reflex ensures that muscles maintain their length, such as
keeping you upright when your knees buckle slightly.
7. "Dermatomes" are specific areas of the skin innervated by:
 A) A single cranial nerve.

 B) A single spinal nerve.

 C) Only the autonomic system.