HUBS 191 - Lecture 8 Pop-Quiz |100% Correct Answers|

HUBS 191 - Lecture 8 Pop-Quiz |100% Correct Answers| Muscle types *Ans* skeletal, cardiac, smooth Smooth muscles *Ans* mainly line hollow organs (eg gut, blood vessels) and are not under voluntary control Cardiac muscle *Ans* located only in the heart, it generates force to pump blood around the body and is not under voluntary control Skeletal muscle *Ans* applies force to the bones to control posture and body movements. It IS under voluntary control. Also known as striated muscle (striped) or voluntary muscle. Primary job of skeletal muscle *Ans* Develop force, force is mainly used to move, and to resist the movement of joints Direction of force of muscles *Ans* Muscles develop force in only 1 direction, that is they can "pull" (develop force by shortening), but they cannot "push" (develop force by actively lengthening) the ability to influence joint movement and position *Ans* allows muscle to enact instructions from brain to produce body movement and to maintain postural control Secondary jobs of the skeletal muscles *Ans* - provides support and protection for soft internal organs (esp muscles of abdominal wall) - Provides voluntary control over major openings that allow passage of substances into or out of the body - Converts energy (in part) to heat which is used to maintain core temperature (eg shivering) - Provides a major "store" for energy and protein Skeletal Muscle fibres *Ans* Huge, multinucleate cells containing large amounts of protein Connective tissues (within skeletal muscle) *Ans* - Ensheath the muscle fibres, and connect fibres to the bones - Ensheathes Fibres, fascicles, and muscles Skeletal muscle is richly supplied with *Ans* - blood vessels - nerve fibres. Fascicles *Ans* bundles of muscle fibers form tendons *Ans* Gathering of connective tissue investment