Question 1

A muscle cell membrane is call the ________.&#10;A) perimysium&#10;B) epimysium&#10;C) endomysium&#10;D) sarcolemma

Accepted Answer

The sarcolemma is the cell membrane of a muscle cell and is responsible for regulating the passage of materials in and out of the cell. The perimysium, epimysium, and endomysium are connective tissues surrounding and supporting muscle cells, but do not refer to the muscle cell membrane itself.

Question 2

Muscle tissue has all of the following properties EXCEPT ________.&#10;A) extensibility&#10;B) excitability&#10;C) secretion&#10;D) contractility

Accepted Answer

Muscle tissue does not have the property of secretion. This property is found in other types of tissues like glands.

Question 3

What are the specialized gap junctions found in cardiac muscle that conduct contraction stimuli from one cardiocyte to the next?&#10;A) striations&#10;B) desmosomes&#10;C) tight junctions&#10;D) intercalated discs

Accepted Answer

Intercalated discs are specialized gap junctions found in cardiac muscle that conduct contraction stimuli from one cardiocyte to the next. Striations are the alternating light and dark bands seen in skeletal and cardiac muscle fibers, desmosomes are cellular junctions that anchor adjacent cells together, and tight junctions are found in epithelial cells and serve to seal adjacent cells together.

Question 4

Compared to skeletal muscle, cardiac muscle ________.&#10;A) cells are larger than skeletal muscle cells&#10;B) has intercalated discs&#10;C) has more nuclei per cell&#10;D) lacks striations

Accepted Answer

Cardiac muscle has intercalated discs, which are specialized cell-to-cell junctions that help synchronize contractions between cells. Skeletal muscle cells are larger than cardiac muscle cells, have more nuclei per cell, and have striations. Therefore, choices A, C, and D are incorrect.

Question 5

All of the following are characteristics of skeletal muscle EXCEPT ________.&#10;A) striated&#10;B) voluntary&#10;C) the cells are long&#10;D) uninucleated

Accepted Answer

Skeletal muscle cells are multinucleate, meaning they have multiple nuclei per cell.

Question 6

What are the embryonic cells that differentiate into muscle fibers?&#10;A) chondroblasts&#10;B) osteoblasts&#10;C) erythrocytes&#10;D) myoblasts

Accepted Answer

Myoblasts are the embryonic cells that differentiate into muscle fibers. Chondroblasts differentiate into cartilage, osteoblasts into bone, and erythrocytes into red blood cells.

Question 7

Which of the following statements is true?&#10;A) Striated muscle cells are long and cylindrical with many nuclei.&#10;B) Smooth muscle cells have many nuclei.&#10;C) Cardiac muscle is found in the heart and large blood vessels.&#10;D) Cardiac muscle cells have many nuclei.

Accepted Answer

Striated muscle cells, also called skeletal muscle cells, are long and cylindrical with many nuclei. Smooth muscle cells have only one centrally located nucleus, while cardiac muscle cells have one or two centrally located nuclei. Cardiac muscle is found only in the heart.

Question 8

Which type of muscle tissue moves or stabilizes the position of the skeleton?&#10;A) skeletal&#10;B) smooth&#10;C) cardiac&#10;D) none of the above

Accepted Answer

Skeletal muscle tissue is responsible for moving and stabilizing the position of the skeleton. Smooth muscle tissue is found in the walls of organs and is responsible for involuntary movements, while cardiac muscle tissue is found in the heart and is responsible for pumping blood. None of the above options would be an appropriate choice for the question except for skeletal muscle tissue.

Question 9

All of the following are true of smooth muscle EXCEPT ________.&#10;A) involuntary&#10;B) spindle shaped&#10;C) multinucleated&#10;D) nonstriated

Accepted Answer

Smooth muscle is uninucleated, meaning it only has one nucleus. It is involuntary, spindle-shaped, and nonstriated.

Question 10

What type of muscle tissue functions to pump blood out of the heart?&#10;A) smooth&#10;B) single-unit skeletal muscle&#10;C) skeletal muscle&#10;D) cardiac muscle

Accepted Answer

Cardiac muscle is the specialized muscle tissue found only in the heart and is responsible for pumping blood out of the heart. It is striated but involuntary, allowing for coordinated contractions of the heart chambers. Smooth muscle is found in the walls of many organs but not the heart, single-unit skeletal muscle is found in small, delicate structures like the iris of the eye or in the walls of the uterus, and skeletal muscle is responsible for movement of the body and is under voluntary control.

Question 11

Which type of muscle tissue is found inside hollow organs, such as the stomach, intestines and blood vessels?&#10;A) multi-unit skeletal&#10;B) skeletal&#10;C) cardiac&#10;D) smooth

Accepted Answer

The answer of Which type of muscle tissue is found...

Deck 9: Muscle Tissue