A skeletal muscle is separated from adjacent skeletal muscles and kept in place by layers of dense connective tissue
Fascia
Connective tissue that attaches muscle of the periosteum
Tendons
Bundles of muscle fibers
Fascicles
Each bundle is covered by layers of connective tissue
Endomysium
The connective tissue that penetrates and divides the individual muscles into compartments
Perimysium
The characteristic striated appearance of skeletal muscle is due to the arrangement of alternating protein filaments composed of ______ and ______.
Actin and myosin
The units that form the repeating pattern along each muscle fiber is called
Sarcomeres
The union between a nerve fiber and a muscle fiber is the
Neuromuscular junction
Connection of skeletal muscle is made possible by ________ in the synaptic cleft
Motor end plate
The substance used by motor neurons to transmit stimuli to skeletal muscle
Acetylcholine/Neurotransmitter
When the filaments of actin and myosin side past each other in the myofibril, the result is
Muscle contraction
The substance stored in large quantities in muscle that can store oxygen is
Myoglobin
The substance that halts stimulation of muscle tissue is
Cholinesterase
Muscle tissue is a major source of
Heat
The finer and more precise the movement produced by a particular muscle, the (fewer/greater) the number of muscle fibers in the motor unit
Fewer
Two types of smooth muscle are _______ muscle and _______ muscle
Visceral and Multiunit
The all-or-none response means
A muscle will have a complete or no contraction
What is included in a motor unit
Several muscle fibers and a motor neuron
The increase in the number of motor units is activated when the intensity of stimulation increases is called
Recruitment
The pigment responsible for the reddish-brown color of skeletal muscles is called
Myoglobin
Muscle fatigue is most likely due to an accumulation of
Latic acid
The lag between the time a muscle is stimulation and the beginning of its response is called
Latent period
This is the connection between the myosin and the actin myofibrils during muscle contraction
Cross-bridges
Chemical substances stored in vesicles of motor neurons which cause muscle contractions when released in the presence of Ca++ are
Acetylcholine
The substance that accumulates in muscles working without enough oxygen is called
Latic acid
The ion that must be released into muscle cells before contractions is called
Calcium
This is the immediate source of energy contractions is called
ATP
This is the compound the stores oxygen in muscle cells
Myoglobin
The muscle that produces a given movement is called the ________ _________
Prime mover
The muscle attachment point on the stationary body part is called
Origin
The muscle attachment point on the moving body part is called
Insertion
The muscle that must relax during a given movement is called the _______
Antagonist
Muscles enter into oxygen debt are functioning _________
Anaerobically
Which myofibril is dark in color with in a skeletal muscle
Myosin
Which myofibril is light in color with in a skeletal muscle
Actin
The connective toss that attaches a muscle to a bone is called
Tendon