Skeletal Muscle
These long, cylindrical cells are also called myofibers and can be up to 30 cm long in the Sartorius muscle.
What are skeletal muscle fibers?
This muscle tissue type is found exclusively in the walls of the heart.
What is cardiac muscle?
Muscle tissue type found in walls of hollow organs and lacking striations.
What is smooth muscle?
The only muscle type under voluntary control.
What is skeletal muscle?
The cytoplasm of a muscle cell.
What is sarcoplasm?
This specialized smooth endoplasmic reticulum in skeletal muscle stores and releases calcium ions.
What is the sarcoplasmic reticulum?
Specialized connections between cardiac muscle cells that support coordinated contractions.
What are intercalated discs?
These muscle cells taper at both ends.
What is spindle-shaped?
Division of the nervous system regulating involuntary muscle actions in the heart and organs.
What is the autonomic nervous system?
The plasma membrane of a muscle fiber.
What is the sarcolemma?
Skeletal muscle fibers are under the control of this division of the nervous system.
What is the somatic nervous system?
Channels within intercalated discs that allow ions to pass between cardiac cells for rapid signal transmission.
What are gap junctions?
Anchoring structures in smooth muscle fibers analogous to Z-discs in other muscle types.
What are dense bodies?
The only muscle tissue containing intercalated discs.
What is cardiac muscle?
The specialized endoplasmic reticulum storing calcium in muscle cells.
What is the sarcoplasmic reticulum?
The plasma membrane surrounding a muscle fiber.
What is the sarcolemma?
Cell junctions in intercalated discs that hold cardiac muscle cells tightly during contractions.
What are desmosomes?
Small membrane indentations that help absorb extracellular calcium.
What are calveoli?
Muscle tissue lacking myofibrils composed of sarcomeres and T tubules.
What is smooth muscle?
The repeating functional unit that generates striations in skeletal and cardiac muscle.
What is a sarcomere?
The repeating contractile unit within myofibrils responsible for striations.
What is a sarcomere?
Specialized cardiac muscle cells that can spontaneously depolarize to regulate heart rate.
What are pacemaker cells?
This system controls involuntary muscle actions in the heart and organs.
What is the autonomic nervous system?
Muscle type characterized by multinucleated fibers and rapid contraction.
What is skeletal muscle?
Cell-to-cell junctions in cardiac muscle that prevent separation during contraction.
What are desmosomes?