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BIOL 252 Exam 2 Practice Questions and Answers with
Complete Solutions UPDATED!!!!
3 components to Purkinje fiber system - ANSWER 1. AV bundle
2. right and left bundle branches
3. terminal branches of Purkinje fibers
3 factors that influence the stroke volume - ANSWER 1. preload
imposed on heart before it contracts
2. hearts contractility, or ability to generate tension
3. after load against which the heart pumps as it contracts
3 population of cells in heart that are capable of spontaneously
generating action potentials and setting the pace of the heart -
ANSWER SA node
AV node
Purkiinje fibers
4 phases of cardiac cycle - ANSWER 1. ventricular filling
2. isovolumetric contraction
3. ventricular ejection
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4. isovolumetric relaxation
A pathway of ATP production that results in the formation of
lactic acid is: - ANSWER glycolytic catabolism
A patient with myasthenia gravis, a disease that destroys
acetylcholine receptors at the motor end plate, will display all
the symptoms except:
a. Muscle weakness and partial or full paralysis
b. Muscle hypertrophy
c. Difficulty swallowing
d. Drooping eyelids and double vision - ANSWER b
A radiograph reveals epiphyseal lines in the long bones of a 12-
year-old's hand. Which of the following statements is correct?
a. The epiphyseal plates have ossified, and further growth in
length is not possible
b. Intramembranous ossification will enable continued growth
in length
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c. Administration of growth hormone will stimulate further
bone growth in length
d. More growth will occur during the teenage years as sex
hormones stimulate rebuilding of epiphyseal plates. - ANSWER
a
A tumor has appeared on the hypothalamus of a seven-year-old
boy, causing increased secretion of GHRH. The increase of
GHRH has in turn increased GH and IGF levels. If left untreated,
the young boy
a. will suffer from acromegaly, in which his bones will increase
in girth, especially his head and facial bones
b. will suffer from gigantism since his epiphyseal plates have not
closed.
c. will have a decreased amount of protein synthesis,
decreasing muscle development and longitudinal bone growth
d. will suffer from pituitary dwarfism, where he will be short in
stature. - ANSWER b
According to the Frank-Starling law, a bigger preload will result
in __________. - ANSWER a stronger contraction
BIOL 252 Exam 2 Practice Questions and Answers with
Complete Solutions UPDATED!!!!
3 components to Purkinje fiber system - ANSWER 1. AV bundle
2. right and left bundle branches
3. terminal branches of Purkinje fibers
3 factors that influence the stroke volume - ANSWER 1. preload
imposed on heart before it contracts
2. hearts contractility, or ability to generate tension
3. after load against which the heart pumps as it contracts
3 population of cells in heart that are capable of spontaneously
generating action potentials and setting the pace of the heart -
ANSWER SA node
AV node
Purkiinje fibers
4 phases of cardiac cycle - ANSWER 1. ventricular filling
2. isovolumetric contraction
3. ventricular ejection
,2|Page
4. isovolumetric relaxation
A pathway of ATP production that results in the formation of
lactic acid is: - ANSWER glycolytic catabolism
A patient with myasthenia gravis, a disease that destroys
acetylcholine receptors at the motor end plate, will display all
the symptoms except:
a. Muscle weakness and partial or full paralysis
b. Muscle hypertrophy
c. Difficulty swallowing
d. Drooping eyelids and double vision - ANSWER b
A radiograph reveals epiphyseal lines in the long bones of a 12-
year-old's hand. Which of the following statements is correct?
a. The epiphyseal plates have ossified, and further growth in
length is not possible
b. Intramembranous ossification will enable continued growth
in length
, 3|Page
c. Administration of growth hormone will stimulate further
bone growth in length
d. More growth will occur during the teenage years as sex
hormones stimulate rebuilding of epiphyseal plates. - ANSWER
a
A tumor has appeared on the hypothalamus of a seven-year-old
boy, causing increased secretion of GHRH. The increase of
GHRH has in turn increased GH and IGF levels. If left untreated,
the young boy
a. will suffer from acromegaly, in which his bones will increase
in girth, especially his head and facial bones
b. will suffer from gigantism since his epiphyseal plates have not
closed.
c. will have a decreased amount of protein synthesis,
decreasing muscle development and longitudinal bone growth
d. will suffer from pituitary dwarfism, where he will be short in
stature. - ANSWER b
According to the Frank-Starling law, a bigger preload will result
in __________. - ANSWER a stronger contraction
