Muscles
Which statement below best describes the role of Ca++ in muscle contraction?
Ca++ binds to troponin, thereby changing its shape to expose the binding site.
Ca++ causes ADP and inorganic phosphate to detach from the myosin cross-bridge.
Ca++ attaches to the myosin head, causing it to disengage from its binding site.
Ca++ crosses the sarcolemma from the axon terminal which allows the action potential to propagate along the sarcolemma.
Ca++ binds to troponin, thereby changing its shape to expose the binding site.
Ca attaches to troponin causing a shape change which shifts the attached tropomyosin away from binding sites of actin.
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Which of the following is the smallest unit in a muscle?A. Muscle fibre
B. Myosin
C. Fasciculus
D. Myofibril
What structures attach a muscle to a bone?
A. A tendon
B. A fasciculus
C. A sarcomere
D. An internal intercostal
Which muscle is located on the posterior part of the forearm?
A. Flexor digitorum superficialis
B. Flexor digitorum profundus
C. Extensor digitorum
D. Triceps brachii
Which of the following muscles is NOT named after its location in the body?
A. Deltoid
B. Extensor carpi ulnaris
C. Rectus abdominis
D. Biceps femoris
Which of the following muscles IS named after its location in the body?
A. Sartorius
B. Triceps brachii
C. Soleus
D. Trapezius
Which is the correct equation for anaerobic respiration in humans?
A. Glucose + lactic acid โ carbon dioxide + water
B. Glucose โ lactic acid + carbon dioxide
C. Glucose โ lactic acid + (little energy)
D. Glucoseโ lactic acid
The part of a skeletal muscle cell that is able to contract is called
A. Sarcoplasm
B. Sarcolemma
C. Sarcomere
D. Sarcoplasmic reticulum
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