WorksheetsBody fluid and circulation (2022) - Quiz 4
Total questions: 10
Worksheet time: 5mins
What normally cause blood to move in the veins back to heart?
Pre-capillary sphincters contraction.
Nearby skeletal muscles contraction.
Closing of valves in the veins.
Energy started in elastic fibres of the walls of veins.
A specialised nodal tissue embedded in the lower corner of the right atrium, close to Atrio-ventricular septum, delays the spreading of impulses to heart apex for about 0.1 sec. This delay allows
the atria to empty completely.
blood to enter aorta.
the ventricles to empty completely.
blood to enter pulmonary arteries.
All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?
SA node has the highest rate of depolarisation.
SA node has the lowest rate of depolarisation.
SA node is the only component to generate the threshold potential.
Only SA node can convey the action potential to the other components.
Which term refers to the severe chest pain evident during an attack of myocardial ischemia?
hypoxia
infarction
angina
diaphoresis
Which of the following events is not recorded on the surface ECG?
Atrial depolarization
Atrial repolarization
Ventricular depolarization
Ventricular repolarization
Compared to the right ventricle, the left ventricle:
holds less blood
develops less pressure during contraction
has a thicker wall
increases in diameter during contraction
Which of these are involved in the early stages of blood clotting?
low-density lipoproteins
erythropoietin
epinephrine
platelets
If the heart rate of a person has increased but the stroke volume is same. The cardiac output will
increase
decrease
remains same
v
During the joint diastole heart receive?
Deoxygenated blood
Oxygenated blood
Venous blood
None
a.= (i), b.= (ii), c.= (iii)
a.= (i), b.= (iii), c.= (ii)
a.= (iii), b.= (i), c.= (ii)
a.= (ii), b.= (i), c.= (iii)
