Exam 12: A: Physiology of the Muscular System

The protein molecule that has heads jutting out for cross-bridging is called myosin.

Slow fibers are also called white fibers because they contain a low concentration of myoglobin.

Smooth,sustained contractions are called treppe.

When sarcomeres shorten,myofibrils also shorten.

Anaerobic respiration is the first choice of the muscle cell for the production of ATP.

When the muscle looks "at rest," the ATP has already transferred its energy to the actin fiber.

Myocyte is another term for muscle cells.

Myofibrils make up myofilaments.

For continued,efficient nutrient catabolism by muscle fibers,both glucose and oxygen are required.

Muscle pain may also be referred to as muscular dystrophy.

Skeletal muscle organs contract on the all-or-none principle.

The motor end plate is part of the neuromuscular junction.

Muscle cells produce heat by the process of catabolism.

Contraction of a small fraction of the total number of fibers in a muscle produces muscle tone.

In the "warmed up" muscle,the calcium ions are able to be completely returned to the sarcoplasmic reticulum.

Shivering in response to a drop in body temperature is an example of a positive feedback mechanism in the body.

Cardiac muscles require a stimulus from a motor neuron to contract,just as striated muscles do.

A triad consists of a T-tubule sandwiched between sacs of the sarcoplasmic reticulum.

Myosin filaments interact with actin filaments during muscle contraction.

The sliding filament theory is the current model of muscle contraction.