The correct answer is: contractile vacuoles.
Paramecium is simple unicellular ciliate that lives in the water environments. It is often used as model organism in laboratory experiments because of its ability to easy conjugate and divide.
Osmoregulation of the paramecium is regulated by contractile vacuoles (one or more within the cell). Contractile vacuoles expel water from the cell in order to compensate for fluid absorbed by osmosis from its water surroundings.
The reason why animals need continuous supply of oxygen is to survive. Almost all of the animals rely on the oxygen in order to be able to survive and function properly.
The oxygen is what enables the respiration, and the respiration is what allows for the cells to be alive and be able to function. Without constant oxygen supply, the cells will not be able to function, thus they will die, which will cause the whole organism to die.
Also, the oxygen is a gas that is used for the burning of glucose into fuel. This basically means that the oxygen is the final detail that enables the organism to obtain nutrients. If the oxygen is not present, than the organism will do everything to create glucose and it will manage to, but it will not be able to turn into a fuel for itself, thus it will not be usable.
The heart is made of involuntary cardiac muscle. to help you remember, cardiac is defined as “relating to heart” so if you’re ever stuck in this question again, look for the word “cardiac” and “heart”
Answer:
The dentritic cells can sense all of the foreign patogens that can invade the body.
Explanation:
Once a patogen comes into the body, the dendritic cells will recognize this patogen and send the information needed to create the right antibodies to protect your body of this invader. Once this happens, the body can start working in an adaptive way, because, if you don't have the right antibodies for the invader, the DCs will need to warn the body to produce lots of different kinds of antibodies, and with that, try to adapt itself to the virus or bacteria.
Answer:
If a negatively charged ion is more concentrated outside the cell, the forces required to balance the chemical gradient would be directed <u>outwards</u>. Thus, the equilibrium potential for this ion would be <u>negatively</u> charged.
Explanation:
The resting membrane potential is normally due to small excess of negative ions inside of positive ions outside the cells.
The negative charges are attracted to the positive charges and they form a thin layer of negative inside and positive outside of the cell. The rest of extracellular and intracellular fluid remains normal.
If negatively charged ion is more concentrated outside the cell, then the forces will move outwards, in order to balance the gradient. Thus resulting in negative equilibrium potential (The potential at which no movement of the ion occur across the membrane)
