Understanding Movement and Muscle Function

Front

Which of the following movements is characterized by the movement of a limb away from the midline of the body? Adduction, Abduction, Flexion, Extension

Back

Abduction

Answer explanation

Abduction is the movement of a limb away from the midline of the body, while adduction is the opposite. Flexion and extension refer to bending and straightening movements, respectively.

Front

When performing a bicep curl, which type of muscle contraction occurs as the weight is lifted towards the shoulder?

Back

Concentric

Answer explanation

During a bicep curl, as the weight is lifted towards the shoulder, the bicep muscle shortens to produce force. This type of contraction is called concentric, as the muscle fibers contract and generate tension.

Front

Which muscle is primarily responsible for dorsiflexion of the foot?

Back

Tibialis Anterior

Answer explanation

The Tibialis Anterior is the primary muscle responsible for dorsiflexion of the foot, allowing the toes to lift upwards. The Gastrocnemius and Soleus are involved in plantarflexion, while the Quadriceps are primarily for knee extension.

Front

Identify the joint movement that occurs when the forearm rotates to turn the palm upward.

Back

Supination

Answer explanation

The correct answer is Supination, which is the movement that occurs when the forearm rotates to turn the palm upward. In contrast, Pronation is the opposite movement, turning the palm downward.

Front

Which muscle group is primarily involved in knee extension? Options: Hamstring, Quadriceps, Deltoid, Gastrocnemius

Back

Quadriceps

Answer explanation

The quadriceps muscle group, located at the front of the thigh, is primarily responsible for knee extension. The hamstrings, deltoid, and gastrocnemius do not play a major role in this specific movement.

Front

During a squat, which type of contraction occurs in the quadriceps as you lower your body?

Back

Eccentric

Answer explanation

During a squat, as you lower your body, the quadriceps lengthen while controlling the descent, which is an eccentric contraction. This type of contraction occurs when a muscle elongates under tension.

Front

Which of the following movements is characterized by decreasing the angle between two body parts? Extension, Flexion, Abduction, Adduction

Back

Flexion

Answer explanation

Flexion is the movement that decreases the angle between two body parts, such as bending the elbow or knee. In contrast, extension increases the angle, while abduction and adduction refer to movements away from or towards the body's midline.

Front

What is the primary function of the deltoid muscle?

Back

Abduction of the arm

Answer explanation

The primary function of the deltoid muscle is the abduction of the arm, which means it helps lift the arm away from the body. The other options do not relate to the deltoid's main action.

Front

Which type of muscle contraction involves maintaining a constant muscle length while tension increases?

Back

Isometric

Answer explanation

Isometric contraction occurs when muscle length remains constant while tension increases, such as when holding a weight steady. This distinguishes it from isotonic contractions, where muscle length changes.

Front

Which movement is characterized by the rotation of the forearm to turn the palm downward?

Back

Pronation

Answer explanation

The movement characterized by the rotation of the forearm to turn the palm downward is called pronation. In contrast, supination refers to turning the palm upward.