Muscle FAQs:

Q: Is muscle a soft tissue found in most animals?

A: Yes.

Q: Are muscles derived from paraxial mesoderm?

A: Yes.

Q: Was muscle found to have evolved independently from the skeletal and cardiac muscle types?

A: Yes.

Q: Are muscles exercised nightly during rapid eye movement sleep?

A: Yes.

Q: Is muscle the strongest?

A: Yes.

Q: Is muscle not under conscious control?

A: Yes.

Q: Is muscle the most important indicator of its role in the body?

A: Yes.

Q: Is muscle derived from the Latin musculus meaning "little mouse" perhaps because of the shape of certain muscles or because contracting muscles look like mice moving under the skin?

A: Yes.

Q: Are muscles arranged in regular, parallel bundles, cardiac muscle sarcomeres connect at branching, irregular angles?

A: Yes, Striated muscle contracts and relaxes in short, intense bursts, whereas smooth muscle sustains longer or even near-permanent contractions.

Q: Are muscles predominantly powered by the oxidation of fats and carbohydrates?

A: Yes, but anaerobic chemical reactions are also used, particularly by fast twitch fibers.

Q: Are muscles dependent on for structure and usage?

A: Yes, and nonbilaterian muscles must be of a different origin with a different set regulatory and structural proteins.

Q: Is muscle arranged in discrete muscles, an example of which is the biceps brachii?

A: Yes, The tough, fibrous epimysium of skeletal muscle is both connected to and continuous with the tendons.

Q: Are muscles "striated" in that they contain sarcomeres that are packed into highly regular arrangements of bundles?

A: Yes, the myofibrils of smooth muscle cells are not arranged in sarcomeres and so are not striated.

Q: Are muscles used at well below their maximal contraction strength for long periods of time?

A: Yes, Aerobic events, which rely primarily on the aerobic system, use a higher percentage of Type I muscle fibers, consume a mixture of fat, protein and carbohydrates for energy, consume large amounts of oxygen and produce little lactic acid.

Q: Is muscle myofibrils?

A: Yes, and which themselves are bundles of protein filaments.

Q: Is muscle typically branched to form a network?

A: Yes.

Q: Are muscles usually found where their length change is less important than maximum force?

A: Yes, such as the rectus femoris.

Q: Are muscles muscle spindles that provide sensory feedback information to the central nervous system?

A: Yes.

Q: Are muscles sheathed by a tough layer of connective tissue called the epimysium?

A: Yes.

Q: Are muscles those with the largest cross-sectional area?

A: Yes.