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:
Cubozoans or the box jellies
Explanation:
These cubozoan or the box jellies is the second class of cnidaria comprising the classic jellyfish. The first class are the Scyphozoans, or "true jellies. The box jellies have as many as two dozen eyes that are not primitive, light-sensing patches of cells but are true eyeballs that are made up of lenses, retinas and corneas. These eyes are paired around the circumference of their bells giving them a 360-degree range of vision. They function in detection of prey and predator and also mainly to maintain the box jelly orientation in water.
Energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. It states that matter can be neither created nor destroyed in ordinary chemical or physical changes.
Answer: A. To break down food into nutrients that can be circulated around the body. :)
You should reask this question and put a picture so that we can understand it better :)
