Human Anatomy and Physiology- Chapter 10 Chapter Test
What can the nervous system do to increase muscle tension? increase the number of active motor units recruit larger motor units increase stimulation frequency All of the listed responses can increase muscle tension.
All of the listed responses can increase muscle tension.
Which of these statements about skeletal muscles is FALSE? Their fibers branch. They pull on tendons. They support soft tissues. They store nutrient reserves.
Their fibers branch.
The soleus muscle is very red in color. Which of these statements about soleus muscle fibers is FALSE? They are large in diameter. They have a slow twitch speed. They are slow to fatigue. They are rich in myoglobin.
They are large in diameter.
During neuromuscular transmission, the axon terminals release __________. acetylcholinesterase sodium ions acetylcholine calcium ions
acetylcholine
When a skeletal muscle fiber is at rest, its ATP demands are met by __________. glycolysis the breakdown of creatine phosphate aerobic metabolism of fatty acids aerobic metabolism of glucose
aerobic metabolism of fatty acids
Which of the following is NOT an effect that exercise will have on muscle tissue? higher concentration of glycolytic enzymes an increase in the number of myofibrils an increase in the amount of fibrous connective tissue an increase in the amount of tension produced when the muscle contracts
an increase in the amount of fibrous connective tissue
Muscles are attached to bones by tendons or __________. ligaments aponeuroses superficial fascia perimysium
aponeuroses
Triads in skeletal muscle fibers function in __________. calcium ion release relaxation neuromuscular transmission calcium ion uptake
calcium ion release
Interactions between the thick and thin filaments are prevented by tropomyosin. To make the active sites accessible, __________ ions must bind to __________. calcium, myosin calcium, actin sodium, troponin calcium, troponin
calcium, troponin
Smooth muscle contracts when calcium binds to __________ and activates __________. troponin; tropomyosin calmodulin; actin calmodulin; myosin light chain kinase troponin; myosin light chain kinase
calmodulin; myosin light chain kinase
A muscle producing its maximum tension for a prolonged period is in __________. complete tetanus treppe incomplete tetanus rigor mortis
complete tetanus
Characteristics of skeletal muscle fibers include all of the following EXCEPT that __________. skeletal muscle fibers are very large each fiber is multinucleated each fiber contains a single nucleus each fiber is striated
each fiber contains a single nucleus
Titin is a(n) __________. thin-filament protein calcium-binding protein tropomyosin-binding protein elastic protein
elastic protein
The capillaries that wrap around each muscle fiber are located within the __________. perimysium sarcolemma epimysium endomysium
endomysium
Muscle fatigue occurs because of a buildup of __________ and a(n) __________ in pH. lactic acid; decrease creatine phosphate; increase creatine phosphate; decrease lactic acid; increase
lactic acid; decrease
The intercalated disk is NOT a site of __________. myofibril attachment action potential propagation neuromuscular transmission force transmission
neuromuscular transmission
Resting smooth muscle can be stretched without affecting tension development because of its __________. extensibility plasticity contractility elasticity
plasticity
Which type of muscle tissue has the greatest effect on the body's heat production? cardiac skeletal smooth All of these muscle types have about the same effect on the body's heat production.
skeletal
What type of muscle fibers has the longest endurance? slow intermediate white fast
slow
The muscle action potential penetrates deep into a fiber along the __________. transverse tubules sarcoplasmic reticulum neuromuscular junction sarcolemma
transverse tubules
