Muscle Tissue Quiz

What is the description of cardiac muscle?

• Striated voluntary

• Non-striated involuntary

• Striated involuntary

• Non-striated voluntary

Answer explanation

Cardiac muscle is characterized as striated due to its banded appearance under a microscope, and it is involuntary, meaning it operates without conscious control. Therefore, the correct description is 'Striated involuntary'.

What happens to acetylcholine after it activates the muscle membrane?

• It is absorbed by the muscle

• It is broken down by acetylcholinesterase

• It remains in the synaptic cleft

• It is converted into dopamine

Answer explanation

After acetylcholine activates the muscle membrane, it is broken down by acetylcholinesterase. This enzyme ensures that acetylcholine does not remain in the synaptic cleft, preventing continuous stimulation of the muscle.

Which muscle type is not directly involved in performing a given movement?

• Prime Mover

• Agonist

• Antagonist

• Synergist

Answer explanation

The antagonist muscle type opposes the action of the prime mover and is not directly involved in performing the movement. Instead, it helps control and stabilize the movement.

Which muscle is located at the back of the lower leg?

• Gastrocnemius

• Biceps brachii

• Rectus abdominis

• Flexor carpi

Answer explanation

The gastrocnemius is the primary muscle located at the back of the lower leg, responsible for plantar flexion of the foot. The other options are not located in the lower leg.

What is the primary function of the Masseter muscle?

• Elevates the jaw

• Moves the lips

• Closes the eyes

• Raises the eyebrows

Answer explanation

The primary function of the Masseter muscle is to elevate the jaw, which is essential for chewing and grinding food. This muscle plays a crucial role in the process of mastication.

Which muscle is located at the back of the neck and assists in head movement?

• Sternocleidomastoid

• Orbicularis oris

• Zygomaticus

• Buccinator

Answer explanation

The sternocleidomastoid muscle is located at the back of the neck and is responsible for rotating and flexing the head. The other options, such as orbicularis oris, zygomaticus, and buccinator, are facial muscles and do not assist in head movement.

Which muscle is responsible for depressing the corners of the mouth?

• Depressor anguli oris

• Frontalis

• Masseter

• Temporalis

Answer explanation

The depressor anguli oris muscle is specifically responsible for depressing the corners of the mouth, which contributes to facial expressions like sadness. The other muscles listed do not perform this function.

What is the role of the Trapezius muscle in the body?

• Moves the shoulders

• Closes the mouth

• Opens the eyes

• Raises the eyebrows

Answer explanation

The Trapezius muscle primarily functions to move the shoulders, allowing for actions such as shrugging and rotating the shoulder blades. The other options relate to facial muscles, not the Trapezius.

What function does the Buccinator muscle serve?

• Closes eye

• Opens eye

• Closes lips

• Flattens cheek; helps in eating, whistling, and blowing wind instruments

Answer explanation

The Buccinator muscle flattens the cheek and plays a crucial role in actions like eating, whistling, and blowing wind instruments, making it essential for these functions.

Which muscle originates from the mandible and maxilla?

• Orbicularis oculi

• Levator palpebrae superioris

• Orbicularis oris

• Buccinator

Answer explanation

The orbicularis oris muscle originates from the mandible and maxilla, encircling the mouth. It is responsible for movements such as closing and puckering the lips, distinguishing it from the other options listed.