Anatomy Chapter 9 Test

Which of the following are correctly paired? a) cardiac muscle; nonstriated b) skeletal muscle; voluntary control c) smooth muscle; striated d) cardiac muscle; voluntary control

Which of the following is not a normal function of muscle tissue? a) producing movement b) stabilizing joints c) secreting hormones d) generating heat e) maintaining posture

Which term best identifies a muscle cell? a)myofibril b)sarcomere c)muscle fascicle d)muscle fiber

In the muscles of the limbs, the origin is usually the immobile muscle attachment - True - False

Which of the following statements is FALSE? a) Skeletal muscle cells have glycosomes. b) Skeletal muscle cells are multinucleated. c) Skeletal muscle cells have T Tubules. d) Skeletal muscle cells contain myoglobin. e) Skeletal muscle cells use creatine phosphate instead of ATP

The contractile, or functional unit of a muscle fiber is ____________. a) the elastic filament b) the sarcomere c) the myofilament d) troponin

Based on what you know of the relationship between the thick and the thin filaments, what would happen if a disorder existed that caused a person to produce no tropomyosin? a) Actin will spontaneously fall apart. b) The muscle would be weaker than normal. c) The muscle would never contract. d) The muscle tissues would never be able to relax.

The sliding filament model of contraction states that_________. a) During contraction, the thing myofilaments slide past the thick myofilaments so that the actin and myosin myofilaments no longer overlap. b) During contraction, the thin myofilaments slide past T tubules so that the Z discs are overlapping c) During contraction, the thin myofilaments slide past the thick myofilaments so that the actin and myosin myofilaments overlap to a greater degree d) During contraction, the thin myofilaments slide past the thick myofilaments so that calcium ions can be released from the sarcoplasmic reticulum.

Which steps precede all other steps? a) The sarcoplasmic reticulum is activated. b) Na+ rushes into the cell. c) An action potential starts on the sarcolemma d) ACh is released by the motor neuron

ATP is required to cause the power stroke in the myosin head. -True -False

A muscle that is lengthening while it produces tension is performing a(n)_______________ contraction. a) concentric b) maximal c) isometric d) eccentric

Identify the correct sequence of the following events. (a) Myosin generates a power stroke. (b) Ca+ binds to troponin. (c) ATP recharges the myosin head. (d) Troponin removes tropomyosin from G actin. (e) The sarcomere shortens. (f) Myosin binds to actin. a) b,d,f,a,e,c b) b,f,a,c,e,d c) e,c,a,b,d,f d) d,b,f,c,a,e e) f,a,c,e,d,b f) a,b,c,d,e,f

Which of the following is most directly required to initiate the coupling of myosin to actin? a) glucose b) ATP c) ACh d) Ca+

The force of a muscle contraction is NOT affected by ____. a) the frequency of the stimulation b) the amount of ATP stored in the muscle cells c) the degree of muscle stretch d) the number of muscle fibers stimulated e) the size of the muscle fibers stimulated.

Slow oxidative muscle fibers are best suited for ________. a) lifting heavy weights at the gym b) running a marathon c) running a 100-yard dash d) running a baseball

Which of the following is true? a) Smooth muscle lacks the thin and thick filaments characteristic of skeletal muscle. b) Skeletal muscle fibers contain sarcomeres; smooth muscle fibers do not c) Skeletal muscle fibers tend to be shorter than smooth muscle fibers d) Skeletal muscle lacks the coarse connective tissue sheaths that are found in smooth muscle

The longer a muscle is when it starts contracting, the more tension it can generate in the contraction. -True -False

Which of the following statements is NOT true regarding ATP production in muscles during periods of prolonged energy use, such as exercise? a) As your blood sugar drops at any time during prolonged activity, glycogen stores in your muscles can be broken down to supply a glucose source. b) Prolonged activity requires the use of aerobic pathways for ATP regeneration. c) In the absence of oxygen, anaerobic pathways provide minimal ATP regeneration for less than a minute. d) In the absence of oxygen, creatine phosphate can drive aerobic respiration pathways for a few minutes.

Which type of muscle is found in the wall of hollow organs? a) skeletal muscle b) unitary smooth muscle c) cardiac muscle d) multi unit smooth muscle

Isometric contractions are important contractions that allow humans to hold their posture over time -True - False