FREE BHK Bachelor of Kinesiology MCQ Questions and Answers
What kind of stimulus does a muscle spindle respond to the most?
One of the proprioceptors that uses muscle length to communicate with the brain about where our body is in space is the muscle spindles. When a muscle is rapidly stretched, a stretch reflex occurs. A motor neuron is then innervated by the muscle spindle to cause the stretching muscle to contract concentrically.
The target muscle is lengthened until a slight stretch is felt when conducting a post isometric relaxation stretch. The target muscle is then tightened and then let go, allowing it to continue to lengthen. An illustration of innervating this proprioceptor is as follows:
To avoid injury, the golgi tendon organ monitors changes in a muscle's tension. Muscle contraction is inhibited if tension in the muscle is excessive compared to the amount of force it can produce. By using this response, one can stretch farther without the muscle protesting. When triggered, the muscle spindle contracts. The Meissner corpuscle recognizes skin slippage. Additionally, the Pacinian corpuscle senses pressure and a high frequency of vibration in the skin.
Which of the following does the opposite of what the vastus lateralis does when it contracts on its own?
As opposed to the vastus lateralis, which just extends the knee, the biceps femoris short head conducts knee extension. While two of the quadriceps muscles, the rectus femoris and the vastus lateralis, are responsible for knee extension, the gracilis is responsible for adduction and medial rotation.
These muscle groups work together effectively because they execute similar tasks.
Adduction, extension, and medial rotation of the glenohumeral joint are all functions carried out by the latissimus dorsi and teres major. Both the major and minor pectoralis work on two distinct joints. While the gluteus medius and maximus perform similar tasks, the latter also flexes the coxal joint. The main resemblance between supraspinatus and teres minor's activities is that both keep the glenohumeral head in the glenoid cavity.
What muscle supports the motion of the moving joint and helps the primary mover by stimulating the same joint motion?
Synergists act on movable joints to assist the prime mover, or the agonist. An antagonist tries to stop the agonist from going the other way. A particular kind of synergist called a fixator retains bones so that tension can be applied to move the agonist.
Which muscle is used when flexing the little toe?
The little toe is flexed by the flexor digiti minimi brevis. The great toe is extended by the extensor hallucis brevis. Both the great toe and the little toe are flexed by the flexor hallucis brevis and the abductor digiti minimi, respectively.
The "little helper" for this muscle is the teres major because of its synergistic effect.
The teres major and latissimus dorsi adduct, rotate the arm medially, and extend it. Abduction, flexion, and medial rotation of the arm are motions of the deltoids. Arm flexion, extension, adduction, and medial rotation are all controlled by the pectoralis major. The spinal column flexion and abdominal compression are caused by the rectus abdominis.