The correct answer is (a.) Its spindle-shaped cells allow it to do smooth muscles. The structure of the cardiac muscles which is spindle-shaped is very important for the heart to withstand the stretching of the muscles during the contractions. Also for its smooth surface which is very important to prevent any possible blood clot during circulation.
If a red blood cell is placed in a hypertonic solution, the cell would shrink.
Hypertonic solution means that the solution has a lower water potential than the other side (which is the cell's cytoplasm in this case), and by that, water molecules would have a tendency to flow from a region of higher water potential to a region of lower water potential. This movement of water molecules is called osmosis. But note that a semi-permeable membrane (a membrane which can decide what substances can go in and out, the cell membrane is an example) has to be present in osmosis, or else the movement may be regarded as diffusion.
As the water molecules flowed away from the red blood cell cytoplasm, the cell loss so much water that the membrane has nothing much to hold and thus the cell shrinks.
Answer:
The ball may be hit above the net and the player's hand hitting the ball may pass to the opponent's side but WITHOUT touching the net.
On the other hand, underneath the net the ball cannot pass, nor can it go to the opponent's court, the bottom of the net is disabled for the game or ball pass.
Explanation:
In volleyball, the net must not be touched, the net must not be dropped and the ball must always pass over it in order for the score to be considered in the game, otherwise, if some of the situations are written, the players will be disqualified. points or they will not be considered
