Answer the following question given this paragraph: Tonicity Tonicity describes how an extracellular solution can change the volume of a cell by affecting osmosis. A solution's tonicity often directly correlates with the osmolarity of the solution. Osmolarity describes the total solute concentration of the solution. 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. In a situation in which solutions of two different osmolarities are separated by a membrane permeable to water, though not to the solute, water will move from the side of the membrane with lower osmolarity (and more water) to the side with higher osmolarity (and less water). This effect makes sense if you remember that the solute cannot move across the membrane, and thus the only component in the system that can movethe watermoves along its own concentration gradient. An important distinction that concerns living systems is that osmolarity measures the number of particles (which may be molecules) in a solution. Therefore, a solution that is cloudy with cells may have a lower osmolarity than a solution that is clear, if the second solution contains more dissolved molecules than there are cells. Hypotonic Solutions Three termshypotonic, isotonic, and hypertonicare used to relate the osmolarity of a cell to the osmolarity of the extracellular fluid that contains the cells. In a hypotonic situation, the extracellular fluid has lower osmolarity than the fluid inside the cell, and water enters the cell. (In living systems, the point of reference is always the cytoplasm, so the prefix hypo- means that the extracellular fluid has a lower concentration of solutes, or a lower osmolarity, than the cell cytoplasm. ) It also means that the extracellular fluid has a higher concentration of water in the solution than does the cell. In this situation, water will follow its concentration gradient and enter the cell. Hypertonic Solutions As for a hypertonic... Q: Which word describes how an extracellular solution can change the volume of a cell by affecting osmosis? Choices: - velocity - trichina - instability - tonicity A:
tonicity
(Question)
Answer the following question given this paragraph: Acceleration is a measure of the change in velocity of a moving object. It measures the rate at which velocity changes. Velocity, in turn, is a measure of the speed and direction of motion, so a change in velocity may reflect a change in speed, a change in direction, or both. Both velocity and acceleration are vectors. A vector is any measurement that has both size and direction. People commonly think of acceleration as in increase in speed, but a decrease in speed is also acceleration. In this case, acceleration is negative and called deceleration. A change in direction without a change in speed is acceleration as well. Q: What is the term for the rate at which velocity changes? Choices: - stability - transmission - compression - acceleration A:
(Answer)
acceleration
Ques: Answer the following question given this paragraph: Population growth is determined by rates of birth, death, immigration, and emigration. Q: Population growth is determined by rates of birth, death, immigration, and what else? Choices: - excitation - relaxation - exploitation - emigration A:
Ans: emigration
(Q).
Answer the following question given this paragraph: Mixtures have different properties depending on the size of their particles. Three types of mixtures based on particle size are solutions, suspensions, and colloids, all of which are described in Table below . You can watch videos about the three types of mixtures at these URLs:. Q: What are the three types of mixtures? Choices: - absorbing , suspensions , colloids - Powders, Gels, Smooth - cosmic , suspensions , colloids - solutions, suspensions, colloids A:
(A).
solutions, suspensions, colloids
Ques:Answer the following question given this paragraph: Muscles work together in pairs to bend or straighten the joint. Q: What work together in pairs to bend or straighten a joint? Choices: - nerve fibers - collagen bands - cartilage tissues - muscles A:

Ans:muscles
Ques: Answer the following question given this paragraph: The hypothalamus is part of the brain and also secretes hormones, thus connecting the nervous and endocrine systems. The pituitary gland is the master gland of the endocrine system and controls other endocrine glands. Endocrine glands also include the thyroid gland, adrenal glands, pancreas, and gonads. Q: What is the master gland of the endocrine system? Choices: - Thyroid - Hypothyroid - Thymus - pituitary gland A:
Ans:
pituitary gland