What prevents the backflow of blood inside the heart during contraction?
Athe septum
Bvalves
Cthick muscular walls
Dthe pericardium
Answer & Solution
Correct answer: B. valves
Heart valves (atrioventricular and semilunar) ensure one-way flow, snapping shut to prevent backflow when chambers contract.
Related questions
By which process do living things release the energy stored in their food?The nitrogenous waste excreted in largest amount by the human kidney isThe green pigment that captures light energy for photosynthesis isThe human heart is made up ofMost of the absorption of digested food into the blood occurs in theThe enzyme in human saliva that begins the digestion of starch isThe basic filtration unit of the human kidney is theThe exchange of gases in leaves takes place through tiny pores called