week 4.1 Muscle Tissue Flashcards
What is the name of the sheath of dense irregular connective tissue that completely surrounds a muscle?
Epimysium
The dilated terminal end of an axon that contacts the muscle cell is called the
Terminal bouton or axon terminal
What is the role of titin in muscle contraction?
The titin molecule prevent overstretching of the sarcomere and also acts like a spring to recoil the sarcomere after it is stretched.
What is ischemia?
Tissue damage because of lack of oxygen
The all-or-nothing contraction of cardiac muscle cells (as opposed to the modulation of contraction) is under the control of what part of the nervous system?
Not the sympathetic division, parasympathetic division, or somatic motor
Which type of muscle cell will increase in number as well as size in response to increased load?
Smooth muscle
The darker region of the sarcomere, as seen in TEM, is where the thick and thin filaments overlap. This region is called the
A band
A group of mesenchymal satellite cells help to repair skeletal muscle cells after injury. They do this by
Differentiating to produce new muscle cells that fuse with existing muscle cells.
The repeated functional units of a myofibril, arranged end to end, are called
Sarcomeres
Which proteins are contained in a thin filament?
-Actin
-Tropomyosin
-Troponin
In a sarcomere, the I band is bisected by a
Z-disk
The function of muscle spindles is
Involuntary contraction by stretch reflex.
Which type of muscle fibers experience rapid fatigue?
Fast glycolytic
Which ion triggers contraction of the sarcomere?
Ca++
Under autonomic control type of muscle cell
Cardiac and smooth
