Answer:
The correct answer is - b Pressure in the atria is lower than in the ventricles.
Explanation:
The atrioventricular valves close when the pressure in the ventricles is more than the pressure in the atria. Which leads to the contraction of the papillary muscles to shut the leaflets of the valves,
When the ventricles relax, atrial pressure exceeds ventricular pressure, the AV valves are pushed open and blood flows into the ventricles. However, when the ventricles contract, ventricular pressure exceeds atrial pressure causing the AV valves to snap shut.
Answer:A few days after fertilization
Explanation
the first option is correct (true).
the greater the surface area of an object the greater the buoyant force.
Answer:
Since plants and fungi are both derived from protists, they share similar cell structures. Unlike animal cells, both plant and fungal cells are enclosed by a cell wall.
