4/27/25, 11:18
AM
BIO 224 TEST EXAM QUESTIONS AND ANSWERS WITH COMPLETE
SOLUTIONS VERIFIED LATEST UPDATE
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Practice questions for this set
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tightly packed filament bundles found within skeletal muscle fibers
Select the correct term
1Sarcomere 2Fascicle
3Myofibril 4Myosin
Don't know?
Terms in this set (120)
Myofibril tightly packed filament bundles found within skeletal
muscle fibers
Sarcomere Functional unit of a myofibril
thick filaments composed of myosin
Thin Filaments Composed of actin
1/
6
, 4/27/25, 11:18
AM
Z line Holds and pulls actin and myosin, shortens sarcomere
and makes muscle contract
Sarcolema Plasma membrane of a muscle fiber
T-tubules membrane bound tubes continuous with the
sarcolemma
sarcoplasmic reticulum System of channels that surround the
myofibrils and is associated with the T-
tubules
Motor neuron stimulates the contraction of muscle fibers
Calcium function in Calcium binds to troponin in myofibril and allows for
contraction actin and myosin interaction
ATP use in muscles used to separate the head of myosin from the actin
molecule
Slow oxidative fibers Specialized for sustained contractions, slow to react
but have holding fibers
Fast glycolytic fibers Specialized for quick response and fatigue easily
Fast oxidative fibers Specialized for quick response but don/e fatigue
Motor Unit Motor neuron that contracts fibers
Recruitment the process where one motor neuron can contract
multiple muscle fibers
FLow of air Nose- Nasal chambers- Pharynx- larynx-trachea-
bronchi-bronchioles-alveoli
Lung location Houseed in the thoracic cavity and surrounded by the
ribs
Breathing regulation Pons and medulla oblongata both control
breathing rates and are regulated by the
amount of CO2 in the blood
Hemoglobin Respiratory pigment that carries oxygen in red blood
cells
Hemoglobin as hemoglobin attaches to additional O2
cooperation molecules the affinity of hemoglobin
increases
At high O2 partial Hemoglobin has a high O2 affininty
pressure
At low O2 partial Hemoglobin has a low affinity for O2
pressure
Bohr Effect Co2 in plasma changes the pH and results in
hemoglobin releasing more oxygen
Cutaneous respiration gases diffuse across body surfaces
Gills Useeful in water and used for respiration
Countercurrent blood and water flow in opposite directions - more
2/
6
AM
BIO 224 TEST EXAM QUESTIONS AND ANSWERS WITH COMPLETE
SOLUTIONS VERIFIED LATEST UPDATE
Leave the first rating
Save
Practice questions for this set
Learn 1/7 Study using Learn
tightly packed filament bundles found within skeletal muscle fibers
Select the correct term
1Sarcomere 2Fascicle
3Myofibril 4Myosin
Don't know?
Terms in this set (120)
Myofibril tightly packed filament bundles found within skeletal
muscle fibers
Sarcomere Functional unit of a myofibril
thick filaments composed of myosin
Thin Filaments Composed of actin
1/
6
, 4/27/25, 11:18
AM
Z line Holds and pulls actin and myosin, shortens sarcomere
and makes muscle contract
Sarcolema Plasma membrane of a muscle fiber
T-tubules membrane bound tubes continuous with the
sarcolemma
sarcoplasmic reticulum System of channels that surround the
myofibrils and is associated with the T-
tubules
Motor neuron stimulates the contraction of muscle fibers
Calcium function in Calcium binds to troponin in myofibril and allows for
contraction actin and myosin interaction
ATP use in muscles used to separate the head of myosin from the actin
molecule
Slow oxidative fibers Specialized for sustained contractions, slow to react
but have holding fibers
Fast glycolytic fibers Specialized for quick response and fatigue easily
Fast oxidative fibers Specialized for quick response but don/e fatigue
Motor Unit Motor neuron that contracts fibers
Recruitment the process where one motor neuron can contract
multiple muscle fibers
FLow of air Nose- Nasal chambers- Pharynx- larynx-trachea-
bronchi-bronchioles-alveoli
Lung location Houseed in the thoracic cavity and surrounded by the
ribs
Breathing regulation Pons and medulla oblongata both control
breathing rates and are regulated by the
amount of CO2 in the blood
Hemoglobin Respiratory pigment that carries oxygen in red blood
cells
Hemoglobin as hemoglobin attaches to additional O2
cooperation molecules the affinity of hemoglobin
increases
At high O2 partial Hemoglobin has a high O2 affininty
pressure
At low O2 partial Hemoglobin has a low affinity for O2
pressure
Bohr Effect Co2 in plasma changes the pH and results in
hemoglobin releasing more oxygen
Cutaneous respiration gases diffuse across body surfaces
Gills Useeful in water and used for respiration
Countercurrent blood and water flow in opposite directions - more
2/
6
