What are the Infoldings of the sarcolemma?
What are the Infoldings of the sarcolemma?
Infoldings of the sarcolemma, called transverse tubules, are associated with two terminal cisternae, forming a unit called a ________. True or false: the sarcoplasmic reticulum releases Ca through gated channels when the t-tubules are stimulated.
What is the outer membrane of a muscle called?
sarcolemma
The sarcolemma (sarco (from sarx) from Greek; flesh, and lemma from Greek; sheath) also called the myolemma, is the cell membrane of a muscle cell. It consists of a lipid bilayer and a thin outer coat of polysaccharide material (glycocalyx) that contacts the basement membrane.
What is the sarcolemma?
The sarcolemma is the plasma membrane of the muscle cell and is surrounded by basement membrane and endomysial connective tissue.
What is the indented region of the sarcolemma?
There are two sets of tubules within skeletal muscles fibers that carry out critical functions during muscle contractions: the sarcoplasmic reticulum and the T tubules. T tubules (transverse tubules) are invaginations, or indentations of the sarcolemma.
What are the two types of Myofilaments?
As illustrated in Figure 2-5, each sarcomere contains two types of myofilaments: thick filaments, composed primarily of the contractile protein myosin, and thin filaments, composed primarily of the contractile protein actin.
How is myofibrillar myopathy diagnosed?
A diagnosis of myofibrillar myopathy is made based on clinical evaluation of the patient’s symptoms as well as tests such as electromyography (EMG), nerve conduction studies (NCV) and muscle biopsy.
What is the difference between Myofiber and myofibril?
As nouns the difference between myofibril and myofiber is that myofibril is (muscle) cylindrical organelles, found within muscle cells, that are the contractile unit of muscles while myofiber is muscle fiber.
Is sarcolemma the same as plasma membrane?
The sarcolemma is a specialized cell membrane which surrounds striated muscle fiber cells. Sometimes called the myolemma, the sarcolemma is similar to a typical plasma membrane but has specialized functions for the muscle cell.
What is sarcolemma and sarcoplasm?
structure of muscle cells called the sarcolemma, separates the sarcoplasm (muscle cell cytoplasm) from the extracellular surroundings. Within the sarcoplasm of each individual muscle fibre are approximately 1,000 to 2,000 myofibrils.
What are the 4 stages of sliding filament theory?
Explanation: In the sliding filament theory, myosin heads attach to an actin filament, bend to pull the actin filaments closer together, then release, reattach, and pull again.
What is the hard outer membrane covering the bones?
The tough, thin outer membrane covering the bones is called the periosteum. Under the hard outer shell of the periosteum are tunnels and canals. Through these, blood and lymphatic vessels carry nourishment for the bone. Muscles, ligaments, and tendons may attach to the periosteum. Bones are classified by their shape.
What type of tissue is at the end of a bone?
This is the smooth tissue at the ends of bones, which is covered with another type of tissue called cartilage. Cartilage is a specialized, rubbery connective tissue. The tough, thin outer membrane covering the bones is called the periosteum. Under the hard outer shell of the periosteum are tunnels and canals.
What is bone?
What is bone? Bone is living tissue that makes up the body’s skeleton. There are 3 types of bone tissue, including the following: Compact tissue.
What is the sponge-like tissue inside bones?
The sponge-like tissue inside bones. Subchondral tissue. The smooth tissue at the ends of bones, which is covered with another type of tissue called cartilage. Cartilage is the specialized, gristly connective tissue that is present in adults. It’s also the tissue from which most bones develop in children.