Exam 2 Flashcards
Muscle !!
The characteristic of muscle that allows it to be passively stretched is?`
Extensibility
The proptery of muscle tissue that allows an impulse to travel down the entire length of the cell membrane is?
conductivity
In general a skeletal muscle is composed of ?
Connective tissue -> nerves -> arteries -> veins -> muscle fibers
What is the correct listing of the hieracrhy of a skeletal muscle’s component ( small to large) ?
Myofibrils -> Muscle fiber -> fascicle -> Fascicle -> skeletal muscle
A flat thin structure made of dense connective tissue that serves to attach a muscle to a bone (or to another muscle) is a ?
aponeurosis
Which letter is associated with a zone (in a relaxed muscle) that is a little more lightly shaded because only thick filaments are present
H
Which of the following structures has the active sites to which the heads of the thick filaments will bind?
Actin
Myoglobin is a molecule within muscle cells that can bind
Oxygen
The presence of mitochondria and myoglobin facilitate_________ respiration in muscle cells.
Aerobic
The repolarization of the action potential involves the opening of
voltage-gated K+ channels
Which sequence correctly lists the changes that allow the thick and thin filaments to slide past one another in skeletal muscle contraction?
Pivot - attach - detach - return
A drug that inhibited acetylcholinesterase would result in
enhanced stimulation of the muscle due to decreased ACh breakdown
For relaxation to occur :
ACh receptors close and Ca++ channels on the sarcoplasmic reticulum close
Glycolysis is an ?
anaerobic process that occurs in the cytosol
Oxidative fibers are?
red and fatigue-resistent
The increase in muscle tension that occurs with an increase in the intensity (voltage) of a stimulus is called?
recruitment
Consider the difference between lifting a light pad of paper versus a heavy textbook. The primary way the level of force of muscle contraction is controlled by?
Recruiting a different number of motor units
Muscle tone is a result of_________ nervous system activity, and it acts to_________ joint position
involuntary, stabilize
When a muscle is isometrically contracted, its length_________ change.
does not
Lifting weights will cause muscles to enlarge. This is primarily due to
An increase in the size of muscle cells
Smooth muscle tissue in which cells are individually sent signals to contract (rather than contracting in unison) is referred to as
multiunit
The most abundant form of smooth muscle is
Single-unit, which is also known as visceral smooth muscle
Which type of smooth muscle is innervated most similar to skeletal muscle, with muscle cells arranged as motor units and each cell stimulated by a single motor neuron?
Multiunit smooth muscle
When a muscle is isometrically contracted, its length_________ change.
Does not
The presence of mitochondria and myoglobin facilitate_________ respiration in muscle cells.
aerobic
