Muscular System > Lab Practical > Question 3
Identify the highlighted muscle.
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Muscular System > Lab Practical > Question 4
Identify the highlighted muscle.
Muscular System > Lab Practical > Question 6
Identify the highlighted muscle in this image that plantar flexes the foot at the ankle.
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The correct answer and explanation is:
To provide the correct answers and a detailed explanation, I need more details about the highlighted muscles in each question. However, based on common muscle identification in lab practicals, I’ll make educated guesses and provide explanations accordingly.
Question 3 & Question 4: Identifying the Highlighted Muscle
Since no image is provided, I’ll assume they focus on commonly tested muscles like the biceps brachii, deltoid, rectus femoris, or trapezius. If you can specify the muscle group or region (arm, leg, back, etc.), I can refine the answer.
Question 6: The Muscle that Plantar Flexes the Foot at the Ankle
The gastrocnemius is the primary muscle responsible for plantar flexion at the ankle joint. It is a two-headed muscle that forms the bulk of the calf and works with the soleus to help in walking, running, and jumping.
Detailed Explanation)
The gastrocnemius is one of the key muscles of the posterior lower leg, originating from the medial and lateral condyles of the femur and inserting into the calcaneus via the Achilles tendon. It is a powerful muscle involved in plantar flexion, allowing the foot to point downward—essential for pushing off the ground when walking or running.
This muscle works in coordination with the soleus, which lies deeper and is more active during slow, sustained movements like standing. The gastrocnemius, in contrast, is more active during explosive movements such as sprinting or jumping. It is innervated by the tibial nerve (S1, S2) and receives blood supply from the posterior tibial artery.
When the knee is extended, the gastrocnemius is in an optimal position for forceful plantar flexion. However, when the knee is bent, the soleus takes over more of the load. Injuries to the gastrocnemius often occur due to sudden accelerations or overstretching, commonly referred to as a “calf strain.”
Understanding this muscle’s function is crucial for physical therapy, sports training, and medical applications, including treating conditions like Achilles tendinitis or calf muscle tears.
Now, I’ll generate an image of the gastrocnemius muscle.
Here is an anatomical illustration of the gastrocnemius muscle, highlighting its origin, insertion, and surrounding muscles. Let me know if you need any modifications or additional explanations!
