9 Review Questions B
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| All of the following are functions of muscle EXCEPT | protection
🗑
|
||||
| An entire skeletal muscle is surrounded by | epimysium
🗑
|
||||
| As an axon enters a muscle, it branches into a number of axonal terminals, each of which forms a neuromuscular junction with a single muscle fiber. A motor neuron and all the muscle fibers it supplies is called a | motor unit
🗑
|
||||
| During muscle contraction, all of the following occur EXCEPT | hemoglobin concentration in muscle fibers increases.
🗑
|
||||
| What is the ion released from the terminal cisternae that combines with troponin and removes the blocking action of tropomyosin, resulting in formation of cross bridges? | Ca2+
🗑
|
||||
| Each skeletal muscle fiber is controlled by a neuron at a single | neuromuscular junction
🗑
|
||||
| In a skeletal muscle fiber, which of the following best describes the composition of the structure known as a triad? | Terminal cisterna, transverse tubule, and terminal cisterna
🗑
|
||||
| In the sliding filament model of muscle contraction, the myofilaments slide over each other, resulting in an overlapping of actin and _________. | myosin
🗑
|
||||
| Interactions between actin and myosin filaments of the sarcomere are responsible for | muscle contraction
🗑
|
||||
| The all-or-none response of a muscle fiber means that | a muscle fiber responds maximally to threshold stimulation or NOT at all.
🗑
|
||||
| The dense layer of collagen fibers that surround an entire skeletal muscle is the | epimysium
🗑
|
||||
| The functional unit of a skeletal muscle fiber is the | sarcomere
🗑
|
||||
| Which statement below does NOT represent a role of ionic calcium in muscle contraction? | Triggers diffusion of Na+ out of the cells
🗑
|
||||
| The space between the neuron and the muscle is the | synaptic cleft.
🗑
|
||||
| The term that means a continued mild or partial contraction of an entire muscle is muscle | tone
🗑
|
||||
| The type of muscle contraction in which the muscle fibers produce increased tension but the muscle neither shortens nor lengthens is called | isometric.
🗑
|
||||
| the role of calcium ions in the contraction of skeletal muscle? | Calcium ions bind to the troponin-tropomyosin complex and remove their inhibitory action on actin/myosin interaction
🗑
|
||||
| the following statements about smooth muscle is true? | Fibers are small and spindle-shaped.
🗑
|
||||
| following statements is INCORRECT | Skeletal muscles are responsible for the pumping action of the heart.
🗑
|
||||
| the following substances increases in quantity during repetitive muscle contraction? | Lactic acid
🗑
|
||||
| The sequence of electrical changes that occurs along the sarcolemma when a muscle fiber is stimulated is known as the | action potential.
🗑
|
||||
| In the early stage of repolarization, the sarcolemma is restored to its initial polarized state initially by | K+ diffusing rapidly out of the muscle fiber.
🗑
|
||||
| During repolarization, the initial events restore only the electrical conditions while the Na+/K+ pump restores the | ionic conditions.
🗑
|
||||
| the following moves Ca2+ back into the tubules of the SR after a contraction? | The ATP-dependent calcium pump
🗑
|
||||
| the following allows recoil of the muscle fiber when contraction ends? | Elastic filaments
🗑
|
||||
| the following binds calcium ions in a smooth muscle causing contraction? | Calmodulin
🗑
|
||||
| the following events is something a smooth muscle can do but cardiac and skeletal muscle can not do? | Grow by hyperplasia or an increase in the number of cells.
🗑
|
||||
| the following types of muscle is found in the eye and are used to regulate the size of the pupil? | Multiunit smooth muscle
🗑
|
||||
| All of the following terms refer to the ability to receive and respond to a stimulus except | contractility.
🗑
|
||||
| Elasticity refers to the ability of a muscle fiber to | recoil and resume its resting length after being stretched.
🗑
|
||||
| the following muscles is voluntary? | the muscle that extends the arm at the elbow
🗑
|
||||
| the following are characteristics of skeletal muscle contraction except | it can contract for long periods of time without tiring.
🗑
|
||||
| Unlike cardiac and smooth muscle, skeletal muscle | must be stimulated by nerve endings to initiate contraction.
🗑
|
||||
| A sarcomere is part of a | myofibril.
🗑
|
||||
| The epimysium is | the overcoat of dense irregular connective tissue that surrounds the whole muscle.
🗑
|
||||
| the following statements about "indirect attachments" of muscle is incorrect? | The epimysium of the muscle fuses with the periosteum of the bone.
🗑
|
||||
| the following characteristics is not unique to skeletal muscle fibers? | They are striated
🗑
|
||||
| The plasma membrane of a muscle cell is known as the | sarcolemma.
🗑
|
||||
| "Cross bridges" that link between the thick and thin filaments are formed by the | globular head of thick filaments
🗑
|
||||
| The function of the protein "dystrophin" is to | links the thin filaments to integral proteins.
🗑
|
||||
| the following is thought to be an autoimmune disease of acetylcholine receptors? | Myasthenia gravis
🗑
|
||||
| The binding of acetylcholine molecules to acetylcholine receptors would lead to all of the following except | sodium would leave the muscle cell.
🗑
|
||||
| The refractory period in which the muscle will not contract if stimulated occurs during __________ of the muscle cell. | repolarization.
🗑
|
||||
| What would happen if the calcium level in the sarcoplasm was kept high? | The cell would calcify and die
🗑
|
||||
| What is the cause of rigor mortis | Calcium influx into the cell after death causes rigor mortis.
🗑
|
||||
| The difference in the speed and duration of contraction of a twitch contraction in different muscles through-out the body is due to the | enzyme variations in different muscles
🗑
|
||||
| the following would produce a " treppe" effect on muscle contraction? | Applying the same strength stimulus for a long period of time.
🗑
|
||||
| In an isotonic eccentric muscle contraction, the muscle generates force as it | increases its length
🗑
|
||||
| The presence of creatine phosphate in the muscle provides | additional energy to the contracting muscle
🗑
|
||||
| Where does 95% of the energy needed for contraction come from during moderate exercise? | ATP provides 95% of energy during moderate exercise.
🗑
|
||||
| The alternating contraction and relaxation of opposing layers of smooth muscle is referred to as | peristalsis
🗑
|
||||
| the following characteristics is unique to smooth muscle? | the absence of striations.
🗑
|
||||
| Cardiac muscle control is voluntary. | False
🗑
|
||||
| Communication between nerve and muscle fiber occurs at specialized junctions called neuromuscular junctions | True
🗑
|
||||
| Cross-bridges are portions of the actin molecules. | False
🗑
|
||||
| During the recovery period following exercise, the body's need for oxygen is increased. | True
🗑
|
||||
| In isotonic contractions, the muscle changes in length and the tension remains constant through most of the contractile period. | True
🗑
|
||||
| Lactic acid is an end product of anaerobic fermentation that causes muscle fatigue. | True
🗑
|
||||
| Muscles that exert very fine control (such as the muscles controlling movements of the fingers and eyes) have large motor units. | False
🗑
|
||||
| One of the functions of the smooth muscle tissue is to force blood from the heart into the major arteries. | False
🗑
|
||||
| The area of the sarcomere that contains only thin and titin elastic filaments is the I band. | True
🗑
|
||||
| The neurotransmitter that stimulates skeletal muscle is adrenalin. | False
🗑
|
||||
| The sequence of events which forms the link between electrical activity in the sarcolemma and the initiation of a contraction is called excitation-contraction coupling. | True
🗑
|
||||
| The skeletal muscle complex known as the triad consists of the transverse tubule and the terminal cisternae | True
🗑
|
||||
| The space between the neuron and the muscle is the synaptic knob. | False
🗑
|
||||
| The type of muscle fiber that is most resistant to fatigue is the fast fiber. | False
🗑
|
||||
| Cross-bridges occur when myosin combines with the active site on actin. | False
🗑
|
||||
| Cross bridge attachment to actin requires K+. | True
🗑
|
||||
| In the initial stages of repolarization the ionic conditions are restored returning the membrane to its resting potential. | False
🗑
|
||||
| Ca++ is essential for skeletal muscle contraction | False
🗑
|
||||
| Below threshold voltage only a small amount of muscle response movement occurs. | True
🗑
|
||||
| At maximal stimulus the muscle is contracting at full strength. | False
🗑
|
||||
| At maximal stimulus the muscle is contracting at full strength | True
🗑
|
||||
| A condition in which a muscle contracts progressively stronger due to warming is called treppe | True
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
schell912
Popular Anatomy sets