Post-Practical Quiz: Muscle

Which type of muscle is found in the wall of blood vessels?

Smooth

Which type of muscle always requires nerve impulses in order to contract?

Skeletal

The reddish brown colour of a muscle is due to the presence of which molecule?

Myoglobin

Which of the following structures are invaginations of the muscle cell's sarcolemma?

Transverse Tubule

Within muscle tissue, where are the neurotransmitter receptors located?

On the motor end plate

What is the main neurotransmitter involved in skeletal muscle contraction?

Acetylcholine

In rigor mortis the stiffness of the muscle tissue is partially due to…

Excessive calcium release in muscle

The soil bacterium Clostridium tetani produces a toxin that can cause tetanus by interfering with the motor neurons. What would be the effect of such an infection on breathing?

If the muscles required for breathing were involved death could follow

Which of the following is a disease which results in muscle weakness because of abnormal neuromuscular junction activity?

Myasthenia gravis

The segment of a myofibril that is called a sarcomere runs between which regions?

From one Z line to the next Z line

The I bands in a sarcomere are made of which structural protein(s)?

Actin

A single motor neuron may innervate as few as 3-5 fibres in muscles of which tissue?

Eye

In isotonic exercises:

The muscle contracts, the joint moves and the muscle fibres shorten or lengthen

In isometric exercises:

The muscle contracts but the joint does not move and the muscle fibres maintain a constant length

What effect does increasing the stimulus frequency between electrical pulses have on stimulus strength?

Increases force of contraction

What is the best description of the expected relationship between stimulus (mA) and response (force in N) when your experimental data was investigated within the laboratory?

Plateau

Summation of frequent muscle twitches to give maximum contraction is called what?

Tetanus

Which one of the following best describes the constant state of contraction of a certain number of muscle fibres within a muscle?

Tone

Which description of muscle contraction means that all the fibres within a muscle are fully contracted?

Tetanic

When a muscle is at rest, which of the following is not chemically associated with the others? (Actin/ myosin/ tropomyosin/ troponin/ all of above)

Myosin

How is excess energy stored within muscle fibres?

As glycogen

Which molecule directly supplies energy to mysoin to allow the filaments to contract?

ATP

Which one of the following best describes the process whereby muscles that are not used may degenerate?

Atrophy

A group of muscle fibres is called a…

Fascicle

Which term describes muscles that act to cause similar movements?

Synergists