Support & Movements

It is an example of ball and socket joint:

• Knee joint

• Elbow joint

• Wrist joint

• Shoulder joint

An action potential in a muscle fiber causes the release of calcium ions from:

• Actin filaments

• Sarcplasm

• Sarcolemma

• Sarcoplasmic reticulum

Muscles are attached to bones through:

• Ligaments

• Cartilage

• Tendons

• Both A and B

The part of skeletal muscle attached to immovable point:

• Insertion

• Belly

• Origin

• Attachment

All of the following are paired bones of face except:

• Maxilla

• Palatine

• Lacrimal

• Vomer

The smallest contractile unit of skeletal muscle is known as

• Sarcomere

• Motor unit

• synapse

• Thin filament

The major regulatory proteins in muscle tissue are:

• Myosin and tropomyosin

• Myosin and actin

• Actin and troponin

• Troponin &tropomyosin

Muscles that straighten two bones at joints are called extensors. What is the name for muscles that cause two bones to bend at joints?

• Protractors

• Flexors

• Adductors

• Abductors

A single somatic motor neuron and the group of muscle fibers innervated by it is

• Somatic unit

• Motor unit

• Associative

• None of these

The contraction of muscles depends upon:

• Nerve impulse

• Energy

• Calcium

• All of these