Circulatory System Quiz

What is the direction of blood flow in the circulatory system?

• From lower pressure to higher pressure

• From high pressure to lower pressure

• From the heart to the lungs only

• From the veins to the arteries

What does CO stand for in the context of blood pressure?

• Cardiac output

• Circulatory output

• Central output

• Capillary output

What is the effect of vasoconstriction on blood vessels?

• Decreases resistance

• Increases resistance

• Has no effect on resistance

• Decreases blood pressure

Which nerve is involved in parasympathetic activity affecting heart rate?

• Sciatic nerve

• Vagus nerve

• Phrenic nerve

• Optic nerve

What is tachycardia?

• Heart rate slower than 60 bpm

• Heart rate faster than 100 bpm

• Normal heart rate

• Heart rate between 60-100 bpm

What effect does an increase in End Diastolic Volume have on stroke volume (SV) and cardiac output (CO)?

• SV and CO increase

• SV and CO decrease

• SV increases, CO decreases

• SV decreases, CO increases

Which condition is associated with decreased partial pressure of O₂?

• Hypoxia

• Hypercapnia

• Acidosis

• Hyperkalaemia

Where are peripheral chemoreceptors located?

• Carotid and aortic bodies

• Medulla oblongata

• Lungs

• Heart

What are central chemoreceptors highly sensitive to?

• Hypercapnia and acidosis

• Hypoxia and hyperkalaemia

• Increased temperature

• Increased osmolarity

What maintains vasomotor tone?

• Moderate constriction of arterioles

• Dilation of veins

• Constriction of capillaries

• Relaxation of arteries