|The ability of skeletal muscle to shorten with force
|The capacity of skeletal muscle to respond to a stimulus
|The ability to be stretched
|Ability to recoil to their original resting length after they have been stretched
|Connective tissue sheath that surrounds each skeletal muscle
|Connective tissue located outside the epimysium.
|Numerous visible bundles that make up muscle
|Loose connective tissue that surrounds muscle fasciculi.
|Muscle cells that make up muscle fasciculi
|Connective tissue sheath that surrounds each muscle fiber
|A threadlike structure that extends from one end of the fiber to the other
|Basic structural and functional unit of the muscle
|Each sarcomere extends from one _ ____ to another _ ____. They're attachment sites for actin.
|ch side of the Z line is a light area called an _ ____, it consists of actin.
|The _ ____ extends the length of the myosin. It is the darker central region in each sarcomere.
|In the center of each sarcomere is another light area called the _ ____, which consists of only myosin.
|The myosin myofilaments are anchored in the center of the sarcomere at a dark staining band called the _ ____.
|the charge difference across the membrane
|resting membrane potential
|brief reversal back of the charge
|Nerve cells that carry action potentials to skeletal muscle fibers
|formed by each branch that connects to the muscle
|neuromuscular junction or synapse
|a single motor neuron and all the skeletal muscle fibers it innervates
|enlarged nerve terminal
|the space between the presynaptic terminal and the muscle cell
|each presynaptic terminal contains _______ ________ that secrete a neurotransmitter called acetylcholine.
|The acetylcholine released into the synaptic cleft between the neuron and muscle cell is broken down by an enzyme, ___________________.
|The sliding of actin myofilaments past myosin myofilaments during contraction
|sliding filament mechanism
|a contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers.
|a muscle fiber will not respond to stimulus until that stimulus reaches a level called _________
|When the stimulus reaches the threshold, the muscle fiber will contract maximally. This phenomenon is called the ___________ ________.
|the time between application of a stimulus to a motor neuron and the beginning of a contraction.
|time of contraction
|the time during which the muscle relaxes
|where the muscle remains contracted without relaxing
|increase in number of motor units being activated
|needed for energy for muscle contraction
|ATP is produced in the ____________
|when at rest muscle cells can't stockpile ATP but they can store another high-energy molecule, called ________ _________
|with oxygen (more efficient)
|amount of oxygen needed in chemical reactions to convert lactic acid to glucose and to replenish the depleted stores of creatine phosphate stores in muscle cells
|results when ATP is used during muscle contraction faster than it can be produced in the muscle cells
|refers to constant tension produced by muscles of the body for long periods of time
|contract quickly and fatigue quickly
|contract more slowly and are more resistant to fatigue
|the most stationary end of the muscle
|the end of the muscle undergoing the greatest movement
|portion of the muscle between the origin and the insertion
|muscles that work together to accomplish specific movements
|muscles that work in opposition to one another
|one muscle that plays the major role in accomplishing the desired movement
|raises the eyebrows
|closes the eyelids
|puckers the lips
|flattens the cheeks
|levator labii superioris
|depressor anguli oris
|change the shape of the tongue
|intrinsic tongue muscles
|moves the tongue
|extrinsic tongue muscles
|lateral neck mucle and prime mover
|group of muscles on each side of the back
|elevate the ribs during inspiration
|contract during forced expiration
|accomplishes quiet breathing
|tendinous area of the abdominal wall
|on each side of the linea alba
|pulls scapula anteriorly
|adducts and flees the arm
|extends the forearm