Stack #3789810 Word Scramble

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Question	Answer
During which phase are calcium ions actively transported into the sarcoplasmic reticulum?	relaxation
What is the role of creatine phosphate during skeletal muscle contraction?	It is used to quickly regenerate ATP from ADP.
T or F: Not all motor units of one entire skeletal muscle contract at once.	True
True or false: Myofilaments shorten during contraction.	false
Muscle fatigue is a condition described by ______ and is usually caused by prolonged use of a muscle.	the loss of a muscle's ability to contract
A muscle that functions to cause action is referred to as the ______.	agonist
The end of a muscle that is fixed (relatively immovable) is called its ______.	Origin
Neurons have extensions (processes) called _______ that carry electrical impulses toward the cell they are innervating	axons
The type of muscle that constitutes about 40% of the body's weight, is responsible for locomotion, facial expressions, posture, respiratory functions, and many other body movements is...	skeletal muscle
The muscle shortens and generates force during the ___ phase of a muscle twitch.	contraction
The first stage of anaerobic and aerobic respiration is ___.	glycolysis
Tube-like invaginations of the sarcolemma that conduct action potentials toward the center of the muscle fiber are called ___.	transverse tubules.
supplies energy for the synthesis of ATP	creatine phosphate
Name the cordlike structures that connect muscles to bone	tendons
The functional connection between a neuron and a skeletal muscle fiber is a	synapse
Binding sites on the surface of actin allow the formation of cross-bridges with molecules of	myosin
Within a skeletal muscle, fascicles are separated from each other by connective tissue called the _____, and muscle fibers are separated from each other by connective tissue called the _____	perimysium and endomysium
Site for storage of calcium	sarcoplasmic reticulum
Threadlike bundles of thick and thin filaments	myofibril
Site of ATP production	mitochondria
The first event in muscle fiber contraction is that	acetylcholine is released from the end of the motor neuron
The enzyme acetylcholinesterase causes acetylcholine to	decompose
A runner collapses during a race and is examined by a doctor. They have lost the ability to plantar flex at the ankle. Which of the following is probably the injured muscle?	Gastrocnemius
Rigor mortis affects skeletal muscles a few hours after death, due to	a decrease in ATP and increased permeability to calcium.
Muscle fatigue is due in part to decreased ATP levels in muscle cells.	TRUE
Transverse (T) tubules are invaginations of the sarcolemma of a muscle cell.	TRUE
Calcium ions bind to __________ in order to initiate a muscle contraction.	Troponin
In order for muscle contraction to occur, cross-bridges form between __________.	Myosin and actin
The muscle that opposes a particular action is called	antagonist
In a recording of a muscle twitch, the delay between the time a stimulus is applied and the time the muscle responds is called the	Latent period
The amount of oxygen needed to repay the oxygen debt includes the amount of oxygen that muscle cells need to resynthesize ATP.	True
Tawanda finishes a sprint and suffers great pain in her calf muscles. Her muscle cramps are most likely due to a temporary deficit of	ATP
bundles of fibers are called ___________ and is covered by the perimysium	fascicles
Which of the following are types of muscles and are involuntary?	Cardiac
In excitation-contraction coupling, the protein called ______ moves to expose binding sites on the actin filaments that can form cross-bridges.	tropomyosin
A skeletal muscle fiber is ______.	a single muscle cell
During muscle contraction, the sarcomeres shorten because ______.	thick and thin filament slide past one another, increasing their overlap
The process of glycolysis is ______.	anaerobic
When is lactic acid produced?	During anaerobic metabolism
True or false: Muscles generate heat when they contract.	True
When a single muscle fiber contracts when stimulated by a single impulse, the contractile response is called a(n) ______.	twitch
The cells of ______ muscle are tapered, lack striations, and have a sarcoplasmic reticulum that is not very extensive.	smooth
During a(n) ______ muscle contraction, the muscle either lengthens or shortens, while the tension stays constant.	isotonic
during high-intensity exercise, anaerobic metabolism results in the production of pyruvic acid, which is then converted to ? acid	lactic
the layer of connective tissue that most closely surrounds an entire skeletal muscle is called the	epimysium
During muscle contraction, calcium ions combine with tropomyosin, and this exposes active sites for cross-bridge formation	false
anaerobic respiration occurs primarily in mitochondria	false
Liver cells convert lactic acid to ATP	false
the minimal strength of stimulation needed to elicit a muscle contraction is called the threshold stimulus	True
if a muscle contracts and its fibers shorten, the contraction is isometric	false
white muscles have an increased capacity to carry on aerobic respiration	false
Metabolic processes can use only about 25% of the energy released by cellular respiration	true
the two major types of smooth muscles are intercalated muscle and cardiac muscle	false
cardiac muscle is voluntary	false
muscles and bones function as levers	true
the masseter muscle functions in mastication	true
exercise can lead to new muscle filament formation---even in old people	true

Created by: yanise2006