Flashcards in Muscle Tissue Deck (89)
What does skeletal muscle attach to?
bone, skin, or fascia
What is Fascia?
Fascia is a fibrous connective tissue that surrounds muscles, groups of muscles, blood vessels, and nerves, binding some structures together, while permitting others to slide smoothly over each other.
Are there striations on fascia?
Yes, there are striations on fascia
Are skeletal muscle voluntary or involuntary?
What are some functions of muscle?
Give shape, produce movement, maintain posture, support other structures, generate heat, regulate organ volumes (sphincters)
What are some properties of muscle tissue?
Skeletal muscles are composed of bundles of muscle fibres called what?
What are fascicles made up of?
fascicles are made up of MUSCLE CELLS that are elongated and striated (aka MUSCLE FIBRES)
What is the membrane called that surrounds the entire muscle?
Epimysium surounds the whole entire muscle
What is the membrane that surrounds individual fascicles?
Perimysium surounds individual fascicles
What is the perimysium?
Perimysium is a membrane that surounds individual fascicles
What is the Epimysium?
Epimysium is the membrane that surounds the whole entire muscle
Name the order in which structures of a muscle reside?
MUSCLE made up of
FASCICLES that contain
MUSCLE FIBRES made up of
MYOFIBRILS made up of
SACROMERE made up of
What are the 3 connective tissue components of muscle tissue
to supply with nerves
Each muscle is supplied by what (3) things?
artery, vien, & nerve
Each muscle fibre is supplied by what (2) things?
(1-2) capillaries & motor neuron
How many muscle cells does a motor neuron innervate?
a motor unit
(several muscle cells about 150 that contract together)
In the formation of muscle cells during embryotic development what fuses together to create the muscle fibre?
What are 2 characteristics of mature muscle cells?
- cannot divide
Some myoblasts remain unfused, what are they called?
What are satellite cells?
myoblast cells that maintain their ability to divide; aren't very many
What is the sarcoplasm?
The cytoplasm of a muscle cell
What is the sarcoplasm composed of?
- mainly myofibrils
- myoglobin (red coloured protein that binds to oxygen; and releases it when it is needed by the mitochondria)
What are transverse tubules?
invaginations of sarcolemma, filled with interstitial fluid, that carry muscle action potentials deep into sarcoplasm; the arrangement ensure that is excited the whole muscle fibre
the action or process of being turned inside out or folded back on itself to form a cavity or pouch.
• a cavity or pouch so formed.
What is the sarcoplasmic reticulum?
It's like an endoplasmic reticulum of a regular cell; stores calcium
What is an endoplasmic reticulum of a non muscle cell?
a network of membranous tubules within the cytoplasm of a eukaryotic cell, continuous with the nuclear membrane.
What is the role of calcium in muscle contraction?
binds to troponin which frees up the binding site on actin so myosin heads can bind