Muscle Tissue Overview Quiz

<p>Churning of food in the stomach (D)</p> Signup and view all the answers

<p>Myosin remains attached to actin with decreased ATPase activity. (D)</p> Signup and view all the answers

<p>Skeletal muscle (A)</p> Signup and view all the answers

<p>It consists of fusiform cells. (B)</p> Signup and view all the answers

<p>Cardiac muscle cells are branched. (A)</p> Signup and view all the answers

<p>Cardiac muscle (D)</p> Signup and view all the answers

<p>They facilitate communication between cardiac muscle cells. (A)</p> Signup and view all the answers

<p>It is restricted to specific soft tissues. (B)</p> Signup and view all the answers

<p>Involuntary and rhythmic (D)</p> Signup and view all the answers

<p>All muscle types are contractile but only skeletal muscle is voluntary. (A)</p> Signup and view all the answers

<p>Contraction to pump blood. (D)</p> Signup and view all the answers

<p>Facilitating movement of the axial and appendicular skeleton. (D)</p> Signup and view all the answers

<p>Presence of intercalated discs. (D)</p> Signup and view all the answers

<p>Contractile, conducting, and secretory fibers. (A)</p> Signup and view all the answers

<p>Smooth muscle (B)</p> Signup and view all the answers

<p>Voluntary (B)</p> Signup and view all the answers

<p>They are multinuclated. (A)</p> Signup and view all the answers

<p>To serve as a conducting system in the heart. (B)</p> Signup and view all the answers

<p>To transmit the action potential deep within the cell (D)</p> Signup and view all the answers

<p>Acetylcholine (A)</p> Signup and view all the answers

<p>Sarcomeres (B)</p> Signup and view all the answers

<p>They activate and form new muscle fibers (A)</p> Signup and view all the answers

<p>Junctional folds (A)</p> Signup and view all the answers

<p>Red muscle fibers (D)</p> Signup and view all the answers

<p>To release calcium ions during stimulation (A)</p> Signup and view all the answers

<p>Underneath the plasma membrane (D)</p> Signup and view all the answers

Muscle tissue is categorized by appearance of contractile cells: striated (with visible cross-striations) and smooth (without cross-striations).

Attached to bones, responsible for body movement and posture. (voluntary)

Striated muscle found in the heart, responsible for heart contractions.

Non-striated muscle found in internal organs, responsible for involuntary movements.

Skeletal muscles are attached to bones, cardiac to the heart, and visceral to other soft tissues like the tongue and diaphragm.

Muscle cells allow movement by contracting and relaxing.

Skeletal muscle is controlled by the somatic nervous system, making it voluntary.

Skeletal muscle is composed of long, tubular structures called muscle fibers.

Cardiac muscle is exclusively found in the heart, forming the heart walls.

Cardiac muscle contracts rhythmically and involuntarily to pump blood throughout the body.

The individual, cylindrical cell of cardiac muscle.

Specialized junctions that connect cardiomyocytes, allowing for coordinated contractions.

Cardiac muscle cells branch and connect with each other, creating a network for synchronized contractions.

Specialized conducting cells in the heart that help regulate the heartbeat.

Cardiac muscle has limited regenerative capacity, making it difficult to repair damage.

Cardiac muscle consists of three types of cells: contractile, conducting, and secretory.

The basic functional unit of a striated muscle fiber, composed of repeating A and I bands. It is the region between two Z lines.

An invagination of the sarcolemma (muscle cell membrane) that carries the action potential deep into the muscle fiber, triggering calcium release from the sarcoplasmic reticulum.

A specialized endoplasmic reticulum in muscle cells that stores and releases calcium ions, which are essential for muscle contraction.

The association of a T-tubule with two terminal cisternae of the sarcoplasmic reticulum, located at the junction of the A and I bands.

The specialized synapse where a motor neuron communicates with a muscle fiber, releasing acetylcholine to trigger muscle contraction.

Invaginations of the sarcolemma at the motor end-plate, increasing the surface area for acetylcholine reception.

A small cell located near muscle fibers that can differentiate into muscle cells to repair damaged tissue.

A type of muscle fiber rich in myoglobin and mitochondria, making it more resistant to fatigue. It contains an isoform of myosin with low ATPase activity.

Specialized cardiac muscle cells that generate the heart's rhythm. They are also called pacemaker cells or pale-staining cells.

The autonomic nervous system regulates heart rate. Sympathetic stimulation increases heart rate, while parasympathetic stimulation decreases heart rate.

Smooth muscle arises from mesenchymal cells, which differentiate into myoblasts, and eventually mature smooth muscle cells.

Smooth muscle is responsible for involuntary movements in hollow organs, like the stomach, uterus, and blood vessels.

Smooth muscle contraction is calcium dependent, but the mechanism is different from striated muscle. Calcium binds to calmodulin, activating myosin light chain kinase, which phosphorylates myosin, enabling it to bind actin and initiate contraction.