Muscles And Their Actions
REVIEW OF MUSCLES AND THEIR ACTIONS. QUESTIONS ARE TAKEN FROM 101 AND 103
Questions and Answers
- 1.
WHICH MUSCLE IS INVOLVED IN MAKING A CLENCHED FIST
- A.
EXTENSOR DIGITORUM
- B.
FLEXOR POLLICUS BREVIS
- C.
ABDUCTOR POLLICUS LONGUS
- D.
PALMARIS LONGUS
Correct Answer
B. FLEXOR POLLICUS BREVISExplanation
The muscle involved in making a clenched fist is the Flexor Pollicis Brevis. This muscle is located in the palm of the hand and is responsible for flexing the thumb. When the Flexor Pollicis Brevis contracts, it allows the thumb to move towards the palm, creating a clenched fist.Rate this question:
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- 2.
WHICH MUSCLE INITIATES A SHOULDER SHRUG
- A.
LATISSIMUS DORSI
- B.
UPPER TRAPEZIUS
- C.
MIDDLE DELTOID
- D.
TERES MAJOR
Correct Answer
B. UPPER TRAPEZIUSExplanation
The upper trapezius muscle initiates a shoulder shrug. This muscle is located in the upper back and neck region and is responsible for elevating and retracting the shoulder blades. When the upper trapezius contracts, it pulls the shoulders upward, causing the shoulder shrug movement. The other muscles listed, such as the latissimus dorsi, middle deltoid, and teres major, are not primarily involved in initiating a shoulder shrug.Rate this question:
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- 3.
IN ORDER TO RAISE HANDS OVER HEAD, BOTH THE TERES MINOR AND MAJOR ARE USED
- A.
TRUE
- B.
FALSE
Correct Answer
A. TRUEExplanation
The teres minor and major muscles are both involved in raising the hands over the head. These muscles are located in the shoulder region and work together to facilitate movements of the arm. The teres minor assists in external rotation of the arm while the teres major helps in adduction and extension of the arm. Therefore, it is correct to say that both muscles are used when raising the hands over the head.Rate this question:
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- 4.
WHICH MUSCLE IS RESPONSIBLE FOR SHOULDER FLEXION
- A.
ANTERIOR DELTOID
- B.
POSTERIOR DELTOID
- C.
MIDDLE DELTOID
- D.
SUPRASPINATUS
Correct Answer
A. ANTERIOR DELTOIDExplanation
The anterior deltoid muscle is responsible for shoulder flexion. This muscle is located at the front of the shoulder and is responsible for lifting the arm forward and upward. It works in conjunction with other muscles to allow for a wide range of motion in the shoulder joint.Rate this question:
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- 5.
ELBOW FLEXION WITH PALM SUPINATED
- A.
BRACHIALIS
- B.
BICEPS BRACHII
- C.
BRACHIORADIALIS
Correct Answer
B. BICEPS BRACHIIExplanation
The correct answer is BICEPS BRACHII because it is the primary muscle responsible for elbow flexion with the palm supinated. The brachialis also assists in elbow flexion, but it is not the primary muscle in this movement. The brachioradialis is responsible for elbow flexion with the palm in a neutral position, not supinated.Rate this question:
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- 6.
ELBOW FLEXION WITH PALM PRONATED
- A.
BICEPS BRACHII
- B.
BRACHIORADIALIS
- C.
BRACHIALIS
Correct Answer
C. BRACHIALISExplanation
The brachialis muscle is responsible for elbow flexion with the palm pronated. This muscle is located deep to the biceps brachii and brachioradialis muscles. It originates from the front of the humerus and inserts into the ulna. When the brachialis contracts, it causes flexion of the elbow joint, bringing the forearm closer to the upper arm. The pronated position of the palm indicates that the brachialis is the primary muscle involved in this movement, as the biceps brachii and brachioradialis are more involved in supination of the forearm.Rate this question:
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- 7.
FLEXION WITH ARM NEUTRAL (THUMB UP)
- A.
BICEPS BRACHII
- B.
BRACHIORADIALIS
- C.
BRACHIALIS
Correct Answer
B. BRACHIORADIALISExplanation
The correct answer is BRACHIORADIALIS. The brachioradialis is a muscle located in the forearm. It is responsible for flexing the forearm at the elbow joint. When the arm is in a neutral position with the thumb facing upwards, the brachioradialis is activated to assist in this movement. The other muscles listed, the biceps brachii and brachialis, also contribute to flexion of the forearm but are not specifically associated with the neutral position of the arm with the thumb up.Rate this question:
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- 8.
THIS MUSCLE DOES ELBOW EXTENSION
- A.
TRICEPS
- B.
POSTERIOR DELTOID
- C.
BICEPS BRACHII
- D.
EXTENSOR CARPII RADIALIS LONGUS
Correct Answer
A. TRICEPSExplanation
The triceps muscle is responsible for elbow extension. It is located on the back of the upper arm and consists of three heads - the long head, lateral head, and medial head. When the triceps contract, they straighten the arm at the elbow joint, allowing for extension of the forearm. This muscle is important for movements such as pushing, throwing, and performing triceps exercises like triceps dips and triceps pushdowns.Rate this question:
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- 9.
THE ABDUCTOR POLLICUS LONGUS IS A WRIST FLEXOR
- A.
TRUE
- B.
FALSE
Correct Answer
A. TRUEExplanation
The abductor pollicis longus is a muscle located in the forearm that is responsible for the abduction of the thumb. When the muscle contracts, it moves the thumb away from the palm of the hand. This action is considered a type of wrist flexion, as it involves the movement of the thumb towards the inner side of the wrist. Therefore, the statement that the abductor pollicis longus is a wrist flexor is true.Rate this question:
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- 10.
WHICH IS A HIP FLEXOR
- A.
GLUTEUS MEDIUS
- B.
PSOAS MAJOR
- C.
BICEPS FEMORIS
- D.
ADDUCTOR MAGNUS
Correct Answer
B. PSOAS MAJORExplanation
The psoas major is a hip flexor muscle that originates from the lumbar vertebrae and inserts into the femur. It plays a key role in flexing the hip joint, allowing us to lift our legs and bring our knees towards our chest. The gluteus medius is a muscle located in the buttocks that primarily functions as a hip abductor, not a hip flexor. The biceps femoris is a muscle located in the back of the thigh that functions as a knee flexor, not a hip flexor. The adductor magnus is a muscle located in the inner thigh that primarily functions as a hip adductor, not a hip flexor.Rate this question:
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- 11.
HIP ABDUCTION IS DONE BY BOTH THE GLUTEUS MEDIUS AND GLUTEUS MINIMUS
- A.
TRUE
- B.
FALSE
Correct Answer
A. TRUEExplanation
The statement is true because both the gluteus medius and gluteus minimus muscles are responsible for hip abduction. These muscles are located on the outer side of the hip and work together to move the leg away from the midline of the body. When these muscles contract, they pull the leg outward, allowing for movements such as side stepping or lifting the leg to the side. Therefore, it is correct to say that hip abduction is done by both the gluteus medius and gluteus minimus.Rate this question:
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- 12.
WHICH IS NOT A KNEE FLEXOR
- A.
SEMITENDINOSUS
- B.
SEMIMEMBRANOSUS
- C.
BICEPS FEMORIS
- D.
RECTUS FEMORIS
Correct Answer
D. RECTUS FEMORISExplanation
The rectus femoris is not a knee flexor. It is one of the four quadriceps muscles located in the front of the thigh and is responsible for extending the knee joint. The semitendinosus, semimembranosus, and biceps femoris are all muscles located at the back of the thigh and are responsible for flexing the knee joint.Rate this question:
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- 13.
RECTUS FEMORIS, VASTUS MEDIALIS, VASTUS LATERALIS, VASTUS INTERMEDIUS ARE
Correct Answer
KNEE EXTENSORS
EXTENSORS
EXTENSORS OF THE KNEEExplanation
The correct answer is knee extensors, extenders, extensors of the knee. These terms refer to the same group of muscles: rectus femoris, vastus medialis, vastus lateralis, and vastus intermedius. These muscles are responsible for extending the knee joint, allowing the leg to straighten.Rate this question:
- 14.
WHICH IS NOT AN ANKLE PLANTAR FLEXOR
- A.
SOLEUS
- B.
EXTENSOR HALLICUS LONGUS
- C.
PLANTARIS
- D.
GASTROCNEMIUS
Correct Answer
B. EXTENSOR HALLICUS LONGUSExplanation
The correct answer is EXTENSOR HALLICUS LONGUS. The extensor hallucis longus is a muscle located in the anterior compartment of the leg, and it is responsible for extending the big toe. It is not involved in ankle plantar flexion, which is the movement of pointing the foot downwards. The other three muscles listed (soleus, plantaris, and gastrocnemius) are all ankle plantar flexors, meaning they contribute to the movement of pointing the foot downwards at the ankle joint.Rate this question:
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- 15.
THE TIBIALIS POSTERIOR IS RESPONSIBLE FOR EVERSION OF THE FOOT
- A.
TRUE
- B.
FALSE
Correct Answer
B. FALSEExplanation
The tibialis posterior is not responsible for eversion of the foot. It is actually responsible for inversion of the foot, which means it helps to turn the sole of the foot inward. Eversion, on the other hand, is the movement that turns the sole of the foot outward. Therefore, the statement is false.Rate this question:
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- 16.
PERONEUS LONGUS, BREVIS AND TERTIUS ARE TESTED IN EVERSION
- A.
TRUE
- B.
FALSE
Correct Answer
A. TRUEExplanation
The statement is true because the peroneus longus, brevis, and tertius are indeed tested in eversion. These muscles are located in the lower leg and are responsible for the movement of eversion, which is the outward rotation of the foot and ankle. When these muscles contract, they work together to pull the foot away from the midline of the body, causing eversion. Therefore, it is correct to say that these muscles are tested in eversion.Rate this question:
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