muscular system anaphy Flashcards
Functions of Muscular System
- Movement
- Maintain posture
- Respiration
- Production of body heat
- Communication
- Heart beat
- Contraction of organs
and vessels
Types of Muscles
- Skeletal
- Cardiac
- Smooth
are muscle cell
Fibers
Abilities of Skeletal Muscles
- Contractility:
ability to shorten - Excitability:
respond to stimulus - Extensibility:
can stretch - Elasticity:
recoil
is cytoplasm
Sarcoplasm
- Contraction and shortening of muscles are due to the movement of
microfilaments
- Skeletal and smooth muscle cells are elongated (muscle cell =
muscle fiber
Skeletal Muscle Characteristics
- Makes up 40% of body weight
- Named because attached to bones (skeleton)
- Many nuclei per cell (near periphery)
- Striated
- Longest of muscle types
plasma membrane
Sarcolemma
endoplasmic reticulum of muscle
Sarcoplasmic reticulum
= contracting structures within a myofibrils; a section of the myofibrils
= joined end to end like train carriages, forms myofibril
=contain microfilaments that slide past
Sarcomeres
long thread-like proteins inside the muscle cell that make up muscle fibers
= contains many microfilaments
Myofibril
sheet or membrane around the cell.
Lemma
refers to flesh or muscle
Sarco
major component of a thin filaments
Actin
is a malignant tumor
Sarcoma
is a molecule that make up a thick micro filaments
Myosin
is a bundle of muscle fiber( cells)
Fascicle
connective tissue that surrounds
entire skeletal muscle (outside)
covers the entire skeletal muscle (protects the muscles from friction against other muscles and bones
- Epimysium
connective tissue around each muscle fasciculus
- Perimysium:
- skeletal muscle cells
Muscle fiber
bundle of muscle fibers
- Muscle fasciculus
thread-like proteins that make up muscle fibers
* long organelles inside muscle cell (cylindrical organelles)
- Myofibril:
connective tissue that surrounds each muscle fiber
- Endomysium