vutushriltai cemoris group includes al s femoris b. vastus lateralis s group inc
ID: 216942 • Letter: V
Question
vutushriltai cemoris group includes al s femoris b. vastus lateralis s group includes all of the following EXCEPT o c. biceps femoris. e. vastus intermedius. 43. Which muscle abduc walking? ts the thigh, medially rotates the thigh, and stabilizes the pelvis during a. biceps femoris luteus minimus c. semimembranosus d. obturator externus 44. Which group is an antagonist to the hamstrings group? a. quadriceps femoris group b. gluteal muscle group c. adductor muscle group d. iliopsoas muscle group 45. Which of the following statements about myofilament s is false? a. El lastic filaments are composed of the protein titin. b. Both thick and thin filaments contain the contractile protein myosin. c. Thin filaments of skeletal muscle contain the regulatory proteins troponin and tropomyosin Thick filaments contain the contractile protein myosin. 46. Which of the following statements regarding the phases of an action potential is true? a. The membrane is depolarized at rest. b. with respect to the outside of the fiber. becomes more negative more positive. The resting membrane potential of the fiber is positive- the inside of the fiber is positive c. Potassium ions rush into the fiber during repolarization, and the membrane potential d. Sodium ions rush into the fiber during depolarization, and the membrane potential becomesExplanation / Answer
42) The quadriceps femoris are group of muscles found in the front & side of the thigh. They are crucial for walking, running, jumping etc. It consists of four muscles- rectus femoris, vastus lateralis, vastus medialis & vastus intermedius. So, clearly biceps femoris is not included in that group. So, the answer will be option c.
43) Biceps femoris- extend the thigh, laterally rotates thigh & flexes knee.
Semimembranosus- extend the thigh, medially rotates leg & flexes knee.
Gluteus minimus- abducts and medially rotates the thigh & stabilizes pelvis.
Obturator externus- adducts and laterally rotates thigh.
So, the correct option will be b.
44) Rectus femoris muscle is an antagonist to the hamstring group. As already shown in Q.42 that rectus femoris muscle is part of the quadriceps femoris. So, the correct option will be a (quadriceps femoris group).
45) Myofilament has 3 types- Thick, Thin & Elastic. Thick filaments are consist of protein myosin. Thin filaments of 3 types of protein- Actin (primary protein), Troponin & Tropomyosin. Elastic filaments are consist of protein titin. So, the answer will be option b as only thick filaments consist of protein myosin, while thin filaments are not.
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