Q2. Which of the following structures is responsible for connecting the femur to the pelvic girdle?A. Glenoid cavityB. AcetabulumC. HumerusD. Clavicle
Q3. Which type of muscle fiber is responsible for quick, powerful contractions but fatigues quickly?A. Red muscle fibersB. White muscle fibersC. Smooth muscle fibersD. Cardiac muscle fibers
Q4. Which structure serves as the functional unit of contraction in a muscle fiber?A. SarcolemmaB. MyofibrilC. SarcomereD. Sarcoplasmic reticulum
Q5. Which joint allows movement in all directions?A. Hinge jointB. Pivot jointC. Ball and socket jointD. Gliding joint
Q6. What is the function of tropomyosin in muscle contraction?A. Activates myosin ATPaseB. Binds calcium ionsC. Regulates actin-myosin bindingD. Stores ATP
Q7. Which of the following is a correct statement about skeletal muscles?A. They are involuntary in nature.B. They have striations and are voluntary.C. They are found in the walls of visceral organs.D. They are non-striated.
Q8. Which of the following bones belongs to the axial skeleton?A. FemurB. HumerusC. SternumD. Scapula
Q9. Which statement about muscle fatigue is correct?A. It is caused by an accumulation of lactic acid.B. It occurs due to a deficiency of glucose in the blood.C. It is caused by excessive ATP availability.D. It is due to excessive calcium ion release.
Q10. Which of the following statements about muscle contraction is incorrect?A. Myosin heads contain ATPase activity.B. Calcium ions play a key role in muscle contraction.C. ATP is not required for muscle contraction.D. Actin filaments slide over myosin filaments during contraction.