Skeletal Muscle pt 2 Flashcards
Exam 3
What are the 8 characteristics of skeletal muscles?
Largest contributor to body weight (non-obese)
Locomotion
Expression
Communication
Body temp
Storage of glycogen
“Effectors”/Targets of nerves
Large store of ions, fluids and proteins
What % of body weight do skeletal muscles contribute to (non-obese)
40%
Ligaments connect _____ to ______
bone to bone
Tendons connect ______ to _______
muscle to bone
- can be muscle-muscle via intermediate tendons
A single skeletal muscle cell is called a _______
muscle fiber
A single muscle fiber contains hundreds of _____
myofibril
What is the name of the cylinders that contain the actin and myosin
myofibril
What do we call a collection of one or more muscle fibers controlled by the same motor neuron?
Motor unit
Larger motor units are _________(easier/harder) to excite than smaller motor units
harder
What is the name of the functional/contractile unit of myofibril?
sarcomere - where myosin and actin overlap
Myosin filaments are also called _______ filaments
thick
Actin filaments are also called ______ filaments
thin
A group of muscle cells is a _________
fasciculous
many fasciculi = ______
muscle
skeletal muscles store energy as _____
glycogen
which two places is glycogen stored?
liver and skeletal muscles
The stronger the muscle cell, the more _______
myofibrils
how is myoglobin different from hemoglobin?
myoglobin has higher affinity for oxygen
Differentiate between type 1 and type 2 skeletal muscle classifications: speed
type 1 - slow
type 2 - fast
Differentiate between type 1 and type 2 skeletal muscle classifications: color
type 1 - red (more myoglobin)
type 2 - white
Differentiate between type 1 and type 2 skeletal muscle classifications: mitochondria
type 1 - a lot
type 2 - less
The _______ is the cell wall of the skeletal muscle cell
sarcolemna
_______ is the alternating color pattern of skeletal and cardiac muscle noted under a microscope
striations
The ____ extends from z disc to z disc
sarcomere
The area in which the thin filaments connect to each other is the _______
z disc
The area where there is only thin filaments is the _______
I band