Chapter 7 The Muscular System -Checkpoting Questions

Front 1

Identify the five primary functions of skeletal muscle.

Back 1

Skeletal muscle produce skeletal movement, maintain body posture adn body position, support soft tissues, guard entraces and exits, and maintain body temperature.

Front 2

Describe the connective tissue layers associated with skeletal muscle tissue.

Back 2

the epimysium is a dense layer of collagen fibers that surrounds the entire muscle; the perimysium divides the skeletal muscle into a series of compartments, each containing a bundle of muscle fibers called a fascicle; and the endomysium surrounds individual skeletal muscles cells (fibers).

Front 3

How would severing the tendon attached to a muscle affect the muscle's ability to move a body part?

Back 3

Severing the tendon woudl prevent the muscle from moving the body part becasue the muscel would no longer be connected to the bone.

Front 4

Describe teh basic structure of a sarcomere.

Back 4

Sarcomeres, the smallest contractile units of a striated muscle cell, are segments of myofibrils. Each sarcomere has dark A band and light I bands. THe A bands contains the M line, H Band, and the zone of overlap. Each I band contains thin filaments, but not thick filaments, Zlines mark the boundaries between adjacent sarcomers.

Front 5

Why does skeletal muscle appear striated when viewed through a light microscope?

Back 5

Skeletal muscle appears striated when viewed under teh microscope because the arrangement of the myofilaments actin and myosin within myofibrils produces a banded appearance.

Front 6

Where would you expect the greatest concentration of calcium ions in resting skeletal muscle to be?

Back 6

You woudl expec to find the greates concentration of calcium ions in teh terminal cisternae of teh sarcoplasmic reticulum of the muscle fiber.

Front 7

Describe the neuromusular junction.

Back 7

The neuromsucular junction-the synapse between a motor neuron and a muscle cell-enables communication between the nervous system and a skeletal msucle fiber.

Front 8

How would a drug that blocks acetylcholine release after muscle contraction?

Back 8

A drug that blocks actylcholine release would prevent muscle conbtraction. A lack of ACh prevents teh generation of action potential in teh sarcolemma, which is necessary for the release of calcium ions from the sarcoplasmic reticulum, and subsequent cross bridge formation.

Front 9

What woudl you expect to happen to a resting skeletal muscle if the sarcolemma sunddenly became vary permeable to calcium ions?

Back 9

If the sarcolemma of a resting skeletal msucle suddenly became permeable to calcium ions, the intracellular concentration of calcium ions woudl increase, and teh muscle woudl contract. In addition, becuase the amount of calcium ions in the sarcoplasm must decline for relaxation to cocur, teh increased permeability of the sarcolemma to calcium ions might prevent the muscle from relaxing completely.

Front 10

Anterior

Back 10

Front

Front 11

Externus

Back 11

Superficial

Front 12

Inferiors

Back 12

Inferior

Front 13

Internus

Back 13

Deep/Internal

Front 14

Intrinsic

Back 14

Inside

Front 15

Medialis/Medius

Back 15

Medial/Middle

Front 16

Posterior

Back 16

Back

Front 17

Profundus

Back 17

Deep

Front 18

Rectus

Back 18

Straight/Parrallel

Front 19

chem/o

Back 19

drug;
chemical

Front 20

Transversus

Back 20

Transverse