Muscles that hold the scapula firmly in place while the forearm moves are called: A) adductors _12) B) agonists C) fixators D) antagonists 13) This name reveals the number of the muscle’s origins. A) adductor longus B) pectoralis major C) temporalis D) biceps brachii 14) The names of these muscles tell you their actions. A) adductor magnus & extensor digitorum B) gluteus maximus & gluteus medius C) external & internal abdominal oblique D) brachioradialis & sternocleidomastoid 15) A runner suffers from a pulled hamstring. Which of these muscles might be involved? A) rectus femoris B) vastis lateralis C) biceps brachii D) biceps femoris An agonist for elbow flexion is-, whereas the一一is an antagonist to this movement. A) triceps brachii, brachialis C) deltoid, biceps brachii 一一16) B) brachioradialis, deltoid D) biceps brachii, triceps brachii 17) The_is a synergist of the latissimus dorsi; it extends, medially rotates, & adducts the humerus. A) teres minor B) supraspinatus C) teres major D) infraspinatus 18) Spasms of this “straplike” muscle often result in wryneck or torticollis. A) serratus anterior B) zygomaticus C) masseter D) sternocleidomastoicd
The Correct Answer and Explanation is :
Here are the correct answers with explanations:
12) Muscles that hold the scapula firmly in place while the forearm moves are called:
C) Fixators
Explanation:
Fixators are muscles that stabilize the origin of the prime mover, allowing for efficient and precise movement. In this case, muscles like the trapezius and rhomboids hold the scapula in position, ensuring that the arm and forearm movements can occur smoothly. Without these stabilizing muscles, the scapula would move excessively, disrupting the arm’s functionality.
13) This name reveals the number of the muscle’s origins:
D) Biceps brachii
Explanation:
The term “biceps” means “two heads,” indicating that the muscle has two points of origin. Similarly, “triceps” refers to three heads, and “quadriceps” refers to four heads. The biceps brachii originates from the scapula at two points: the supraglenoid tubercle and the coracoid process.
14) The names of these muscles tell you their actions:
A) Adductor magnus & extensor digitorum
Explanation:
Muscle names often describe their functions. For example, the adductor magnus adducts the thigh, while the extensor digitorum extends the fingers. In contrast, names like “gluteus maximus” describe size or location, not action.
15) A runner suffers from a pulled hamstring. Which of these muscles might be involved?
D) Biceps femoris
Explanation:
The biceps femoris, part of the hamstring group, works alongside the semitendinosus and semimembranosus to flex the knee and extend the hip. A pulled hamstring typically involves one or more of these muscles.
16) An agonist for elbow flexion is, whereas the antagonist to this movement is:
D) Biceps brachii, triceps brachii
Explanation:
The biceps brachii is the primary muscle (agonist) responsible for elbow flexion, while the triceps brachii serves as the antagonist, counteracting the movement by extending the elbow.
17) The _ is a synergist of the latissimus dorsi; it extends, medially rotates, & adducts the humerus:
C) Teres major
Explanation:
The teres major assists the latissimus dorsi in its movements, including extending, adducting, and medially rotating the humerus.
18) Spasms of this “straplike” muscle often result in wryneck or torticollis:
D) Sternocleidomastoid
Explanation:
The sternocleidomastoid muscle runs along the neck and is responsible for head rotation and flexion. Spasms in this muscle can lead to torticollis, a condition characterized by abnormal head tilt.