Regions of the myofibril
This is the contractile region of the myofibril. It is bounded by the z discs.
What is a sarcomere?
Muscle cells are elongated, and so they are often referred to by this additional name
What are muscle fibers?
This type of muscle is found only at the heart, and it can contract without nervous system stimulation.
What is cardiac muscle?
This protein consists of 4 polypeptide chains and has a head which binds to actin
What is myosin?
While muscle is important for movement, it is also responsible for generating this, which is important for maintaining the homeostasis of our body
What is heat generation?
This is the thick filament of the myofibril.
What is myosin?
This is the layer of connective tissue that surrounds each individual muscle fiber
What is the endomysium?
This term describes a muscles ability to forcibly shorten when stimulated.
What is contractibility?
This protein covers the active site of actin preventing myosin from binding.
What is tropomyosin?
Each muscle is served by an artery, a nerve, and one or more of these structures
What are veins?
This lighter band of the sarcomere is composed solely of actin.
What is the I band?
This layer of dense irregular connective tissue surrounds the entire muscle.
What is the Epimysium?
This involuntary muscle type can be found in the walls of the hollow organs and at the skin. A distinguishing feature is that it is not striated.
What is smooth muscle?
This type of actin is the binding site for the myosin head.
This is the anchoring point for muscle that can be made of bone or connective tissue
What is the origin?
This is the lighter region of the A band where actin does not overlap with myosin
What is the H zone?
This is a group of muscle fibers working together
What is a fascicle?
These multinucleated cells are under voluntary control
What is skeletal muscle?
This protein makes sure the actin and myosin stay parallel to each other
What is C-protein? (aka: myosin-binding protein)
This term describes a muscles ability to receive and respond to stimuli
What is excitability?
These are dark lines at the center of each I band that have proteins to attach the thin filaments
The endomysium is composed of this type of connective tissue
What is fine areolar connective tissue?
This term describes a muscles ability to recoil back to resting length.
What is elasticity?
This protein holds the thick filaments to the Z line and prevents separation during stretching.
What is titan?
This is a sheet like attachment of muscle to bone
What is an aponeurosis?