Week 9/10 Musculoskeletal system Flashcards
Muscles exhibit the property of excitability. This means that the muscle
A) shortens its length
B) recoils to its original resting length.
C) stretches beyond its normal length.
D) responds to stimulation by the nervous system.
E) excites itself.
D) responds to stimulation by the nervous system.
The capacity of a muscle cell to shorten forcefully is known as A) contractility B) excitability C) extensibility D) elasticity E) flexibility
A) contractility
Identify the statement concerning general functional characteristics of muscle that is true.
A) muscle tissue shortens forcefully but lengthens passively.
B) muscle tissue shortens passively but lengthens forcefully.
C) muscle tissue can get shorter, but can not get longer.
D) muscle tissue can get longer, but can not shorter.
E) None of the above statements are true.
A) muscle tissue shortens forcefully but lengthens passively.
Identify the statement concerning skeletal muscle that is true.
A) It comprises about 20% of the body’s weight.
B) it propels urine through the urinary tract.
C) its function is largely under involuntary control.
D) it is a kind of connective tissue.
E) its is responsible for locomotion.
D) it is a kind of connective tissue.
Which of the following actions is caused by contraction of skeletal muscle?
A) contraction of the heart
B) moving your feet in walking
C) movement of food through the G.I. tract
D) emptying of the urinary bladder
E) vasconstriction
B) moving your feet in walking
Smooth muscle and cardiac muscle are similar in that they both A) are under involuntary control B) are striated C) are widely distributed in the body D) have multiple nuclei E) are under voluntary control
A) are under involuntary control
Which of the following is true?
A) skeletal muscle is found in the walls of hollow organs
B) smooth muscle is found in the walls of hollow organs.
C) cardiac muscle cells have multiple nuclei
D) smooth muscle cells are long and cylindrical
E) there is a small amount of smooth muscle in the heart
B) smooth muscle is found in the walls of hollow organs
Hypertrophy of skeletal muscles from weight lifting is caused by an increase in the
A) number of muscle fibbers
B) size of muscle fibers
C) number of striations
D) number of nuclei within the muscle fibbers
E) number of muscle cells
B) size of muscle fibers
Skeletal muscle fibers
A) possess striations
B) can contract but are not extensible or excitable
C) do not require nerve innervation to contract
D) increase dramatically in number after birth
E) are found in the walls of the stomach
A) possess striations
A fascicle (or fasciculus) A) is a bundle of reticular fibers B) is surrounded by perimysium C) is only found in smooth muscle D) possess an external lamina E) is a bundle of collagen fibers
B) is surrounded by perimysium
Endomysium is a delicate network of loose connective tissue that A) surrounds each muscle fiber B) forms a sheath around a fasciculus C) is composed of elastic fibers D) separates indivdual muscles E) penetrates muscle fibers
A) surrounds each muscle fiber
Which of the following connective tissue layers is outside all the others? A) perimysium B) endomysium C) epimysium D) paramysium E) sarcolemma
C) epimysium
List the following structures in order from smallest to largest 1. muscle fibre 2. myofilament 3. myofibril 4. muscle fasciculus A) 4,2,3,1 B) 2,1,4,3 C) 3,1,4,2 D) 2,3,1,4 E) 1,2,3,4
D) 2,3,1,4
Muscle myofibrils A) are found in the sarcolemma B) extend from the sarcolemma to the T-tubule C) contain myosin and actin myofilaments D) hold muscle cells together E) do not appear striated
C) contain myosin and actin myofilaments
T-tubules A) provide nutrients to the muscle finer B) generate new muscle fibers C) conduct action potentials deep into the muscle cell D) release acetylcholine E) store calcium ions
C) conduct action potentials deep into the muscle cell
