Pathak- Muscle Flashcards
(17 cards)
0
Q
Cardiac Muscle
A
- only in the heart
- irregular stripes
- branched cell shape
- intermediate contraction
- involuntary
- pumps blood
1
Q
Smooth Muscle
A
- unstriped
- spindle cell shape
- one nucleus per cell
- slow contraction
- usually involuntary
- controls movement of substances through hollow organs
- no organized sarcomeres
- digestive tract
2
Q
Skeletal Muscle
A
- striated (stripped)
- spindle/ cylindrical cell shape
- slow to rapid contraction
- moves skeleton
- voluntary
3
Q
Actin and Myosin
A
- cause muscle contraction
- muscle proteins
- actin found in THIN filaments
- mysosin found in THICK filaments
4
Q
Muscle fiber
A
- one of the largest cells in the human body
- individual muscle cell
- 10 to 100 micrometers in diameter
5
Q
Myofibers
A
Individual contractile subunits at the ends of muscle fibers
6
Q
Sarcoplasmic reticulum
A
- series of double sheets of membrane surrounding myofibers
- form interconnected hollow tubes
- fluid store high concentration of CALCIUM IONS
7
Q
Sacromeres
A
Subunits of myofibrils
8
Q
Thin filament
A
- located in each sarcomeres
- formed by a tin and two accessory proteins
9
Q
Thick filament
A
- Between thin filaments
- composed of myosin in contact with thin filaments
10
Q
Cross bridges
A
Small branches of myosin molecules that connect thin and thick filaments
11
Q
Z lines
A
- Structures thin filaments are attached to
- at junction points between adjacent sarcomeres
12
Q
Muscle contraction
A
- Controlled by a process that depends on molecular structure of the thin filaments
- uses SLIDING FILAMENT MECHANISM
13
Q
Gap junctures
A
In cardiac and smooth muscles
14
Q
Tetany
A
Maximum contraction caused by rapid firing
15
Q
Neuromuscular junctions
A
- Where motor neurons form synapses with muscle cells
- always excitatory
16
Q
Motor unit
A
Groups of fibers where a motor neuron forms synapse
