What organ does not contain smooth muscle?

What organ does not contain smooth muscle?

Single-unit muscle has its muscle fibers joined by gap junctions so that the muscle contracts as a single unit. This type of smooth muscle is found in the walls of all visceral organs except the heart (which has cardiac muscle in its walls), and so it is commonly called visceral muscle.

What features are not present in smooth muscle quizlet?

Smooth muscle cells lack myofibrils and sarcomeres.

Are there T tubules in smooth muscle?

Vascular smooth muscle cells do not contain the complex t-tubule/sarcoplasmic reticulum system common to striated muscles, but rather they contain a significant number of invaginations along the plasma membrane called caveolae, which serve a similar, albeit less developed role to increase the cellular surface: volume …

What is the structure of a smooth muscle cell?

Smooth muscle consists of thick and thin filaments that are not arranged into sarcomeres giving it a non-striated pattern. On microscopic examination, it will appear homogenous. Smooth muscle cytoplasm contains a large amount of actin and myosin. Actin and myosin act as the main proteins involved in muscle contraction.

Which one feature below is found in smooth muscle?

Apart from the lack of striations, the smooth muscle differs from the other two by the cell shape. The smooth muscle cells are typically spindle-shaped and the nuclei are centrally located. The cells have a higher actin/myosin ratio than skeletal muscle cells.

What muscles are smooth muscles?

The iris is one of the body’s smooth muscles, which lack striations and contract without conscious control. Smooth muscle is one of three types of muscles in the body. Smooth muscle may be found in the trachea.

Is there smooth muscle in the digestive tract?

Smooth muscles are found primarily in the digestive tract (esophagus, small and large intestine) urinary tract ( ureter , bladder), reproductive system (uterus, vaginal walls) and endocrine system (ducts). Smooth muscle is typically non-striated, uni-nucleated, and involuntary or reflexive.

What is another name for smooth muscle?

smooth-muscle | definition: one of the contractile organs of the body | synonyms: involuntary muscle, levator, sphincter muscle, antagonistic muscle, muscle fiber, muscle fibre, skeletal muscle, pronator, contractor, sphincter, eye muscle, striated muscle, musculus, rectus, smooth muscle, supinator, muscle cell, ocular muscle, anatomical sphincter, contractile organ, tensor| antonyms: bad, medulla, cortex, vulnerability, unsoundness

What is smooth tissue?

Smooth muscle tissue is defined as a non-striated muscle tissue comprising involuntary contractile elements surrounding tissues and structures where contraction is part of normal function.