Q: Which of the following equations best represents the flow of information in a simple reflex arc?

$$\text{Stimulus} \rightarrow \text{Receptor} \rightarrow \text{Sensory (afferent) neuron} \rightarrow \text{Integrating center} \rightarrow \text{Motor (efferent) neuron} \rightarrow \text{Effector}$$

Question 1

Which of the following correctly lists the sequence of components in a typical reflex arc?

Accepted Answer

Receptor → Sensory (afferent) neuron → Integrating center → Motor (efferent) neuron → Effector

Question 2

During the patellar reflex, which nerve is primarily responsible for transmitting the sensory and motor signals?

Accepted Answer

Femoral nerve

Question 3

A patient presents with an absence of the Achilles tendon reflex. Which nerve is most likely impaired?

Accepted Answer

Tibial nerve

Question 4

Which component of the reflex arc is responsible for interpreting the sensory input and determining the appropriate response?

Accepted Answer

Integrating center

Question 5

If the motor (efferent) neuron in a reflex arc is damaged, which of the following outcomes is most likely?

Accepted Answer

The effector will not respond to the stimulus.

Question 6

Which of the following best describes the role of the effector in a reflex arc?

Accepted Answer

It carries out the response initiated by the integrating center.

Question 7

A person steps on a sharp object and immediately withdraws their foot. Which part of the reflex arc is responsible for detecting the painful stimulus?

Accepted Answer

Receptor

Question 8

Which of the following equations best represents the flow of information in a simple reflex arc?

Accepted Answer

$$	ext{Stimulus} ightarrow 	ext{Receptor} ightarrow 	ext{Sensory (afferent) neuron} ightarrow 	ext{Integrating center} ightarrow 	ext{Motor (efferent) neuron} ightarrow 	ext{Effector}$$

Question 9

In the patellar reflex, what is the effector that produces the knee-jerk response?

Accepted Answer

Quadriceps femoris muscle

Question 10

Which of the following scenarios best illustrates the function of the integrating center in a reflex arc?

Accepted Answer

A spinal interneuron receives sensory input and sends a signal to a motor neuron.

Question 11

A patient has damage to the femoral nerve. Which reflex is most likely to be affected?

Accepted Answer

Patellar reflex

Question 12

Which of the following is NOT a component of a reflex arc?

Accepted Answer

Synaptic cleft

Question 13

If the tibial nerve is damaged, which reflex would most likely be diminished or absent?

Accepted Answer

Calcaneal (Achilles) tendon reflex

Question 14

Which of the following best explains why reflex arcs are important for survival?

Accepted Answer

They allow for rapid, involuntary responses to potentially harmful stimuli.

Question 15

Which nerve is tested during the clinical assessment of the Achilles tendon reflex?

Accepted Answer

Tibial nerve

Question 16

A patient has a normal patellar reflex but an absent Achilles tendon reflex. Which nerve is most likely functioning normally?

Accepted Answer

Femoral nerve

Question 17

Which of the following is the correct order of events in the patellar reflex?

Accepted Answer

Tap on patellar tendon → Stretch receptor activation → Sensory neuron → Spinal cord (integrating center) → Motor neuron → Quadriceps contraction

Question 18

Which of the following best describes the function of a sensory (afferent) neuron in a reflex arc?

Accepted Answer

It transmits information from the receptor to the integrating center.

Question 19

Which of the following would most likely result from damage to the integrating center in a spinal reflex arc?

Accepted Answer

Reflex responses would be absent or abnormal.

Question 20

A patient is unable to contract their quadriceps muscle in response to a patellar tendon tap. Which part of the reflex arc is most likely impaired?

Accepted Answer

Motor (efferent) neuron

Reflex Arcs and Tendon Reflexes: Key Components and Nerves

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