Question

Match List - I with List - II muscle movements and muscles producing those movements. 

Choose the correct answer from the options given below : 
 

• A. A-II, B-IV, C-III, D-I
• B. A-IV, B-II, C-I, D-III
• C. A-IV, B-I, C-II, D-III
• D. A-II, B-IV, C-I, D-III

Hint:

Visual mnemonics work best here: Dorsiflexion = imagine a dolphin's "Dorsal" fin pointing up (toes point up $\rightarrow$ Tibialis anterior). Plantar flexion = "Planting" your foot flat on the ground or pressing down (toes point down $\rightarrow$ Calf muscles/Gastrocnemius).

Answer 1

The Correct Option is D

Step 1: Concept:
This question requires matching basic anatomical muscle actions and movements of the human lower limb to the specific primary skeletal muscles responsible for generating those actions.

Step 2: Step-by-step Explanation:

• A. Flexion (of the knee joint): Bending the knee (decreasing the angle of the joint) is primarily driven by the hamstring muscle group located on the posterior aspect of the thigh. The Biceps femoris is one of the major muscles in this hamstring group. Thus, A matches with II.

• B. Extension (of the knee joint): Straightening the knee (increasing the angle) is powerfully driven by the large muscle group on the anterior aspect of the thigh, collectively known as the Quadriceps femoris. Thus, B matches with IV.

• C. Dorsiflexion (of the ankle joint): Lifting the foot upwards so that the toes point toward the shin is performed by the anterior compartment muscles of the lower leg. The primary muscle for this action is the Tibialis anterior. Thus, C matches with I.

• D. Plantar flexion (of the ankle joint): Pointing the foot and toes downward (similar to pressing a gas pedal in a car) is performed by the large posterior calf muscles, mainly the Gastrocnemius and the underlying soleus. Thus, D matches with III.

• Compiling all the correct matches together yields: A-II, B-IV, C-I, D-III.

Step 3: Final Answer:
Option (D) provides the perfectly aligned pairs for these muscle actions.