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WorksheetsPhysiology Practice Worksheet - Circulatory System
Total questions: 35
Worksheet time: 1hrs 1mins
Which structure prevents backflow of blood within the heart?
Ventricle with thick walls
Atrium with thin walls
Valve with cusps
Aorta carrying high pressure
Which vessel carries deoxygenated blood from the heart to the lungs?
Aorta distributing oxygenated blood
Pulmonary vein entering left atrium
Pulmonary artery leaving right ventricle
Superior vena cava draining head
Which chamber is the upper chamber of the heart?
Aorta exiting heart
Septum dividing heart
Ventricle pumping blood
Atrium receiving blood
Which chamber is primarily responsible for pumping blood to the body?
Left atrium receiving pulmonary vein
Right ventricle sending to lungs
Right atrium collecting venous blood
Left ventricle forcing systemic flow
What is the largest artery in the body?
Pulmonary artery to lungs
Inferior vena cava return
Aorta from left ventricle
Superior vena cava return
The right side of the heart pumps blood to the lungs for oxygen. Which vessel carries this blood out of the heart?
Coronary artery near surface
Pulmonary vein with valves
Pulmonary artery under pressure
Aorta with semilunar cusps
Which vessel returns oxygenated blood from the lungs to the heart?
Inferior vena cava systemic
Pulmonary vein high oxygen
Superior vena cava mixed
Pulmonary artery low oxygen
During systemic circulation, blood leaves the left ventricle through which vessel?
Aorta to body tissues
Pulmonary vein to heart
Pulmonary artery to alveoli
Superior vena cava to atrium
Which statement best describes the septum?
Vessel carrying coronary blood
Valve controlling flow direction
Wall separating right and left
Muscle forming atrial floor
Which structure directly receives blood from the superior vena cava?
Left ventricle generating pressure
Left atrium receiving oxygenated
Right ventricle pushing pulmonary
Right atrium collecting venous
Which label would correctly mark the vessel bringing blood from the lower body into the heart?
Inferior vena cava return
Pulmonary artery deoxygenated
Aorta with elastic walls
Pulmonary vein with oxygen
In pulmonary circulation, what is the primary purpose?
Filter plasma in kidneys
Exchange gases in lungs
Deliver nutrients to tissues
Store blood in veins
Which sequence correctly represents the path of blood from body tissues back to the lungs?
Capillaries → aorta → ventricles
Veins → right atrium → right ventricle
Arterioles → pulmonary vein → aorta
Arteries → left atrium → left ventricle
What role do heart valves play in circulation?
Produce red blood cells
Store oxygen for later use
Prevent backward blood movement
Increase heart rate during exercise
If the left ventricle becomes weaker, which outcome is most likely?
Higher systemic blood pressure
Reduced cardiac output to body
Increased pulmonary vein oxygen
Faster atrial depolarization rate
Which change occurs to heart rate during exercise compared with rest?
Remains constant despite demand
Stops briefly during contraction
Increases to meet oxygen needs
Decreases due to vasodilation
Given a resting heart rate of 72 bpm and an exercise heart rate of 132 bpm, what is the difference?
48 beats per minute
132 beats per minute
72 beats per minute
60 beats per minute
Why does heart rate increase during exercise?
To store glucose in the liver
To reduce blood pH rapidly
To deliver more oxygen to muscles
To lower body temperature quickly
Increasing heart rate during exercise helps maintain homeostasis by:
Reducing ventilation efficiency
Halting CO2 removal temporarily
Sustaining oxygen supply to tissues
Decreasing cardiac output notably
Which vessel carries oxygenated blood to the heart from the lungs?
Aorta with elastic recoil
Pulmonary vein returning oxygen
Superior vena cava returning systemic
Pulmonary artery leaving right heart
Which sequence correctly traces the path of air from entry to the site of gas exchange?
Pharynx → nose → trachea → bronchi → alveoli
Mouth → pharynx → larynx → trachea → bronchi → alveoli
Larynx → mouth → bronchi → trachea → alveoli
Nose → larynx → trachea → bronchioles → alveoli
What primary muscle contracts to increase thoracic volume during inhalation?
Laryngeal muscles opening wider
Abdominal muscles lifting upward
Diaphragm flattening downward
Intercostal muscles mainly expanding inward
In the alveoli, oxygen diffuses into the blood primarily because of which gradient?
Partial pressure gradient of gases
Concentration gradient of proteins
Temperature gradient across tissues
Electrical gradient between ions
Which statement best describes carbon dioxide removal from the body?
CO2 binds lipids and exits through skin
CO2 stored in muscles until needed
CO2 dissolves in plasma and is exhaled
CO2 converts to glucose and is urinated
Which structure directly surrounds alveoli to enable gas exchange?
Dense venous sinuses only
Capillary beds with thin walls
Thick elastic arteries network
Cartilaginous rings for support
Hemoglobin’s main role in oxygen transport is to
Hydrolyze oxygen into atoms
Bind oxygen reversibly to iron
Pump oxygen actively into cells
Convert oxygen to bicarbonate
During vigorous exercise, which change helps maintain homeostasis?
Increased ventilation and cardiac output
Reduced capillary perfusion in muscles
Suppressed hemoglobin oxygen affinity
Decreased heart rate and ventilation
Which pairing correctly matches structure and function in the respiratory tract?
Alveoli—cartilage keeps airway open
Pharynx—oxygen binds to hemoglobin
Bronchioles—conduct air to alveoli
Trachea—gas diffusion across walls
Where does the respiratory and circulatory systems interact most directly for gas exchange?
Larynx lumen airflow
Alveolar–capillary interface
Bronchial cartilage surface
Right atrial endocardium
What primarily drives oxygen from alveolar air into red blood cells?
Negative charge of erythrocytes
Greater blood temperature than air
Higher alveolar PO2 than blood
Active transport using ATP
Select the artery that pumps red blood cells carrying carbon dioxide into the lungs.
Select 3 points where deoxygenated blood passes through
Select 3 points where oxygenated blood passes through
Trace the flow of blood in order
8
7
6
5
1
2
3
4
What is the primary function of this body system? The primary function of the (a) system is to deliver (b) and (c) to the body
