Below Are Given the Steps of the Patellar Reflex Arc

question 90

Multiple Choice

Below are given the steps of the patellar reflex arc.What is the correct order of events from the time the hammer taps the patellar ligament to the knee jerk response? 1) The leg extends at the knee.
2) Sensory neurons conduct the action potentials to the spinal cord.
3) Motor neurons are stimulated and generate an action potential.
4) Sensory neurons synapse with motor neurons in the spinal cord.
5) The AP travels to the quadriceps femoris and cause it to contract.
6) Sensory receptors in the muscle detect the stretch of the tendon and muscles.

• A)3,4,6,2,5,1
• B)6,2,4,3,5,1
• C)5,3,6,2,4,1
• D)6,5,4,2,3,1
• E)1,5,3,4,2,6

---

Definitions:

Protostomes

A group within the animal kingdom that includes organisms in which the mouth develops from the primary embryonic opening.

Radial Cleavage

A type of embryonic development in deuterostomes where the planes of cell division are either parallel or perpendicular to the vertical axis of the embryo, resulting in the cells being positioned directly above or beside each other.

Cleavage

Series of mitotic cell divisions, without growth, that converts the zygote to a multicellular blastula.

Meiotic Cell Divisions

A type of cell division that reduces the chromosome number by half, leading to the production of gametes in sexual reproduction.