Multiple Choice
The genioglossus is the primary muscle involved sticking out your tongue. The styloglossus is responsible for pulling the tongue back in, making it a(n) _______ for sticking out your tongue?
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10. Muscles
Muscle Actions
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
The prime mover for flexion of the thigh is the __________ muscle.
A
quadratus lumborum
B
sartorius
C
psoas minor
D
iliopsoas
Verified step by step guidance1
Understand the concept of a 'prime mover' in muscle actions. The prime mover, or agonist, is the muscle that provides the primary force driving the action.
Identify the action in question: flexion of the thigh. This involves moving the thigh forward and upward, typically at the hip joint.
Consider the muscles listed: quadratus lumborum, sartorius, psoas minor, and iliopsoas. Determine which of these muscles is primarily responsible for thigh flexion.
Recall that the iliopsoas muscle is a major hip flexor. It is composed of two muscles: the psoas major and the iliacus, which work together to flex the thigh at the hip joint.
Conclude that the iliopsoas is the prime mover for flexion of the thigh, as it is the most powerful and effective muscle for this action.
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