What do you mean by tonicity Class 9?

Tonicity is the relative concentration of the solutions that determine the direction and the extent of diffusion. … Isotonic Solution: The relative concentration of water molecules and the solute on either side of the cell membrane is the same.

What is an example of tonicity?

EXAMPLES. Tonicity is the reason why salt water fish cannot live in fresh water and vice versa. A salt water fish’s cells have evolved to have a very high solute concentration to match the high osmolarity of the salt water they live in.

What is the importance of tonicity?

Having a good understanding of tonicity gives a good insight into how dehydration can affect the cells of the body. An isotonic solution is best because the osmotic pressure within and outside the cell is equal, so there is no net movement of water and the cells will retain their shape and function.

How do you identify tonicity?

According to our students’ reports, they found it helpful to remember that tonicity is defined by the effect a solution has on cell volume at equilibrium, and that tonicity is determined by comparing the concentrations of nonpenetrating solutes in the solution and the cell.

What is tonicity in chemistry?

Tonicity is defined as the ability of a solution surrounding a cell to cause that cell to gain or lose water (Urry et al., 2017). While osmolarity is an absolute quantity, tonicity is relative. … If two solutions have the same concentration of nonpenetrating solutes, they are considered isotonic.

What is tonicity in plants?

Tonicity is a measure of the relative concentration of solute particles on either side of a semi-permeable membrane (e.g. inside a cell versus outside the cell). Only solutes that cannot cross the membrane contribute to tonicity. It determines the direction and extent to which water moves by osmosis.

What is tonicity and osmolarity?

Osmolarity is a measure of the osmotic pressure of a given solution. Tonicity is a measure of the osmotic pressure gradient between two solutions separated by a permeable membrane.

What is tonicity physiology?

The ability of an extracellular solution to make water move into or out of a cell by osmosis is known as its tonicity. Tonicity is a bit different from osmolarity because it takes into account both relative solute concentrations and the cell membrane’s permeability to those solutes.

What is tonicity quizlet?

Tonicity. A description of the relative solute concentration in a solution as compared to another solution. Equilibrium. The condition that exists in system when there is a relatively equal distribution of a particular molecule. Hypertonic.

What is the tonicity of plasma?

A major physiology text (Ganong 16th ed., 1993) defines tonicity as a term used to describe the osmolality of a solution relative to plasma (as in hypotonic, isotonic or hypertonic).

How does tonicity affect cells?

The tonicity of a solution is related to its effect on the volume of a cell. A hypotonic solution causes a cell to swell, whereas a hypertonic solution causes a cell to shrink. … Although it is related to osmolality, tonicity also takes into consideration the ability of the solute to cross the cell membrane.

How does tonicity relate to Osmosis?

Tonicity describes how an extracellular solution can change the volume of a cell by affecting osmosis. … A solution with low osmolarity has a greater number of water molecules relative to the number of solute particles; a solution with high osmolarity has fewer water molecules with respect to solute particles.

What is tonicity agent?

Tonicity is a measure of the effective osmotic pressure gradient; the water potential of two solutions separated by a partially permeable cell membrane. … There are three classifications of tonicity that one solution can have relative to another: hypertonic, hypotonic, and isotonic.

What is the tonicity of glucose?

Tonicity depends only on the concentration of nonpenetrating solutes, so any solution of pure glucose will be hypotonic, no matter what its osmolarity, and tonicity describes only the change in cell volume at equilibrium.

What is the tonicity of h2o?

What is mOsmol kg?

In the relatively dilute fluids in the body, the osmolality is measured in milliosmols (one-thousandth of an osmole) per kilogram of water (mOsmol/kg). Osmolarity is similar but is defined as the number of osmoles (or mOsmol) per liter of solvent.

What is tonicity and how does it affect the condition of the cell quizlet?

The ability of a surrounding solution to cause a cell to gain or lose water. What is the tonicity of a solution dependent on? The tonicity of a solution is dependent on its concentration of solutes compared to the concentration of solutes within the cell. You just studied 13 terms!

What does Hypoosmotic mean?

1. Of, relating to, or characterized by having a lower osmotic pressure than a surrounding fluid under comparison. 2. A condition in which the total amount of solutes (both permeable and impermeable) in a solution is lower than that of another solution.

How is osmolarity calculated?

Osmolarity is an estimation of the osmolar concentration of plasma and is proportional to the number of particles per litre of solution; it is expressed as mmol/L. Calculated osmolarity = 2 (Na+) + 2 (K+) + Glucose + Urea (all in mmol/L); OR Calculated osmolarity = 2 (Na+) + Glucose + Urea (all in mmol/L). …

How much is an osmole?

Explanation: An osmole (Osmol) is 1 mol of particles that contribute to the osmotic pressure of a solution.