Lecture 5 Cardiovascular System Flashcards
According to research, which of the following cardiovascular factors declines with age in sedentary individuals?
A) size of left ventricles
B) collagen content of arteries
C) endothelial function
D) muscle sympathetic nerve activity
C) endothelial function
During dynamic exercise, cardiac output is lower in children versus adults for a given level of VO2. What compensates for the lower cardiac output to ensure sufficient tissue oxygenation?
A) Higher a-vO2 difference
B) Higher heart rate
C) Higher stroke volume
D) Higher lactate levels
A) Higher a-vO2 difference
According to research,
which of the following
cardiovascular factors declines with age in
sedentary individuals?
a) Muscle sympathetic nerve activity
b) Endothelial function
c) Collagen content of arteries
d) Resting blood pressure
b) endothelial function
Which chamber of the heart typically undergoes the greatest enlargement during the ageing process in adults?
a) Left Atrium
b) Right Atrium
c) Left Ventricle
d) Right Ventricle
c) Left Ventricle
Which of the following statements relating to ageing and left ventricular filling rate is false?
a) Myocardium in older adults is slower to relax following contraction.
b) Ageing is typically associated with smaller early diastolic volume.
c) Late diastolic filling is typically reduced in older adults.
d) Abnormalities in the E/A fatio with ageing are indicative of diastolic dysfunction.
c) Late diastolic filling is typically reduced in older adults
Which of the following factors is not typically associated with arterial remodeling and increased arterial stiffness?
a) thickening of the vessel wall
b) increase in elastic fibres
c) extracellular matrix calcification
d) collagen deposition
b) increase in elastic fibres
The major factors that explain the fall in VO2max with age include all of the following except:
a) decreased cardiac output
b) decreased a-vO2 difference
c) increase in fat mass
d) loss of muscle mass
c) increase in fat mass
