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What primarily causes motion at joints?

Muscle contraction (correct)

Bone density

Joint lubrication

Ligament flexibility

How many skeletal muscles does the human body have?

Over 800

Over 600 (correct)

Over 400

Over 200

Which statement about the origins of skeletal muscles is true?

They are always smaller than insertions.

They always move.

They normally remain stationary. (correct)

They attach directly to tendons.

What are the non-contractile elements of a muscle responsible for?

Distributing tension and supporting structure Signup and view all the answers

What is a key component of a motor unit?

Motor neurone Signup and view all the answers

Which principle explains the recruitment order of motor units?

Size principle Signup and view all the answers

What does the 'all or none' law refer to in muscle contraction?

A motor unit either contracts fully or not at all. Signup and view all the answers

Why is variability in motor unit sizes important?

It influences the force generating capacity. Signup and view all the answers

Which of the following movements is primarily associated with the ankle joint?

Dorsiflexion Signup and view all the answers

What muscle is predominantly responsible for ankle plantarflexion?

Soleus Signup and view all the answers

Which of the following actions does the subtalar joint NOT perform?

Lateral rotation Signup and view all the answers

What is the primary function of the tibialis posterior muscle?

Support foot arches Signup and view all the answers

During which movement does the foot move towards the midline of the body?

Inversion Signup and view all the answers

Which of the following muscles is NOT responsible for ankle movements?

Quadriceps femoris Signup and view all the answers

Which movement is characterized by the toes moving away from the shin?

Plantarflexion Signup and view all the answers

What is primarily impaired if the ankle joint’s dorsiflexion is limited?

Walking on heels Signup and view all the answers

Which intrinsic muscles are primarily responsible for extending the toes?

Extensor digitorum brevis Signup and view all the answers

Which of the following muscles is not an intrinsic muscle that flexes the toes?

Extensor hallucis longus Signup and view all the answers

Which intrinsic muscles are responsible for abducting the toes?

Dorsal interossei Signup and view all the answers

What is a primary function of the intrinsic muscles that adduct the toes?

To bring the toes closer to the midline Signup and view all the answers

Which intrinsic muscle acts as an antagonist to those that flex the toes?

Extensor digitorum longus Signup and view all the answers

What is the role of intrinsic muscles in the foot?

To produce foot movements Signup and view all the answers

Which of the following intrinsic muscles is known for adducting the toes?

Plantar interossei Signup and view all the answers

Intrinsic muscles that extend the toes include which of the following?

Extensor digitorum brevis Signup and view all the answers

Which muscle is not primarily classified as an intrinsic muscle of the foot?

Tibialis anterior Signup and view all the answers

To which group do the intrinsic muscles that help flex the toes belong?

Flexors Signup and view all the answers

Where do the two heads of gastrocnemius arise?

Medial and lateral condyles of the femur Signup and view all the answers

What separates each head of gastrocnemius from the knee joint capsule?

Popliteal bursa Signup and view all the answers

What happens to the heads of gastrocnemius as they pass down the leg?

They taper into a single tendon Signup and view all the answers

Where does the gastrocnemius ultimately attach?

Calcaneus via the tendocalcaneus Signup and view all the answers

What is the nerve supply of gastrocnemius?

Tibial nerve Signup and view all the answers

What are the actions of the gastrocnemius muscle?

Plantarflexion of the foot and knee flexion Signup and view all the answers

What is the main activity during which the calf muscles exert their force on the posterior part of the foot?

Jumping Signup and view all the answers

How much strain is the tendocalcaneus able to withstand?

10 times body weight Signup and view all the answers

What do the plantar interossei muscles primarily do?

Adduct the toes Signup and view all the answers

Which intrinsic muscle is located in the 1st layer of the foot?

Abductor digiti minimi Signup and view all the answers

What is the primary function of the dorsal interossei muscles?

Abduct the toes Signup and view all the answers

How many layers of intrinsic muscles are typically described in the foot?

4 layers Signup and view all the answers

What is the function of the plantar aponeurosis?

Support the arches of the foot Signup and view all the answers

Which muscle is known to be located on the dorsum of the foot?

Extensor digitorum brevis Signup and view all the answers

What happens to the arches of the foot when weight is applied?

They become flatter Signup and view all the answers

Which muscle is included in the 3rd layer of intrinsic muscles in the foot?

Adductor hallucis Signup and view all the answers

Untitled Quiz

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Questions and Answers

What primarily causes motion at joints?

How many skeletal muscles does the human body have?

Which statement about the origins of skeletal muscles is true?

What are the non-contractile elements of a muscle responsible for?

What is a key component of a motor unit?

Which principle explains the recruitment order of motor units?

What does the 'all or none' law refer to in muscle contraction?

Why is variability in motor unit sizes important?

Which of the following movements is primarily associated with the ankle joint?

What muscle is predominantly responsible for ankle plantarflexion?

Which of the following actions does the subtalar joint NOT perform?

What is the primary function of the tibialis posterior muscle?

During which movement does the foot move towards the midline of the body?

Which of the following muscles is NOT responsible for ankle movements?

Which movement is characterized by the toes moving away from the shin?

What is primarily impaired if the ankle joint’s dorsiflexion is limited?

Which intrinsic muscles are primarily responsible for extending the toes?

Which of the following muscles is not an intrinsic muscle that flexes the toes?

Which intrinsic muscles are responsible for abducting the toes?

What is a primary function of the intrinsic muscles that adduct the toes?

Which intrinsic muscle acts as an antagonist to those that flex the toes?

What is the role of intrinsic muscles in the foot?

Which of the following intrinsic muscles is known for adducting the toes?

Intrinsic muscles that extend the toes include which of the following?

Which muscle is not primarily classified as an intrinsic muscle of the foot?

To which group do the intrinsic muscles that help flex the toes belong?

Where do the two heads of gastrocnemius arise?

What separates each head of gastrocnemius from the knee joint capsule?

What happens to the heads of gastrocnemius as they pass down the leg?

Where does the gastrocnemius ultimately attach?

What is the nerve supply of gastrocnemius?

What are the actions of the gastrocnemius muscle?

What is the main activity during which the calf muscles exert their force on the posterior part of the foot?

How much strain is the tendocalcaneus able to withstand?

What do the plantar interossei muscles primarily do?

Which intrinsic muscle is located in the 1st layer of the foot?

What is the primary function of the dorsal interossei muscles?

How many layers of intrinsic muscles are typically described in the foot?

What is the function of the plantar aponeurosis?

Which muscle is known to be located on the dorsum of the foot?

What happens to the arches of the foot when weight is applied?

Which muscle is included in the 3rd layer of intrinsic muscles in the foot?

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