Low heart rate is seen in
a) Fever
b) Infancy
c) Hemorrhage
d) Hypothyroidism
e) Cardiac failure
Answer
a. F
b. F
c. F
d. T
e. F
Discussion
a.
- Increase body temperature increase firing rate of SA node therefore heart rate increase
b.
- Infant has a high heart rate
Age
|
Beats/ min
|
< 1 year
|
110 - 160
|
2-5 years
|
95-140
|
5-12 years
|
80-120
|
>12 years
|
60-100
|
c.
- In hemorrhage , total blood volume decreases
- Venous return decreases
- Stoke volume decrease
- Cardiac output decreases
- Blood pressure decreases
- Firing rate of baroreceptor decrease
- Sympathetic discharge to SA node reduce and parasympathetic discharge increases
- Heart rate increase initially
- But later in hemorrhage heart decreases
d.
- Hypothyroidism induces bradycarida and hyperthyroidism
induce tachycardia
e.
- In heart failure cardiac output reduce
- Blood pressure decreases therefore with hemorrhage heart rate increase
Labels: CVS, CVS MCQ, Physiology MCQ