Homeostasis & Transport Study Island

What is the difference between active transport and passive transport?

Active transport requires the cell to expend energy, while passive transport does not.

There are two main ways in which molecules are transported into and out of cells - active transport and passive transport. Which of the following statements is true of passive transport?

Carrier proteins are sometimes used during passive transport.

Usually, only molecules that are fat-soluble can permeate across a cell membrane. Why is this the case?

Cell membranes are composed of a lipid bilayer.

How does a cell's membrane help an organism maintain homeostasis?

Cell membranes control the substances that enter or leave cells.

How does exocytosis help a cell maintain its homeostasis?

Cells must dispose of wastes in order to maintain their homeostasis.

Which of the following best describes the process of diffusion?

Diffusion is the movement of molecules from an area of higher concentration to one of lower concentration by random molecular motion.

What happens if the body is unable to maintain its blood glucose levels?

Diseases, such as diabetes and hypoglycemia, result.

How do enzymes aid in cell regulation?

Enzymes speed up reactions that help sustain life.

How is homeostasis important to the survival of organisms?

Homeostasis allows organisms to regulate their temperature.

Which of the following are forms of cell regulation?

I, II, and III

Which of the following is a function of the cell membrane of a cell?

The transport of molecules into and out of the cell through osmosis and diffusion.

Which of the following images shows how the perfume molecules will most likely look after ten minutes have passed, if the system is not affected by outside forces?

W

What will happen to the substances in this diagram to bring the concentrations closer to equilibrium?

Water will flow out of the cell and into the surrounding environment.

Which of the following forms of cellular transportation helps human cells maintain a relatively constant sodium and potassium concentration?

a cell membrane pump

This hormone speeds up the movement of sugar out of the blood, so the blood sugar level decreases and returns to equilibrium.This is an example of

a feedback mechanism.

Osmosis is the diffusion of water across a selectively permeable membrane in which water moves from a solution containing a low concentration of solute to what kind of solution?

a solution containing a high concentration of solute

Cells use __________ to take in large molecules or other cells.

active transport by endocytosis

What mechanism does a cell use to move these small potassium molecules into the cell against the concentration gradient?

active transport by proteins

Materials essential to life processes move across a cell membrane through a variety of methods. What cell membrane structure allows water-soluble materials to be passively transported to the cytoplasm?

carrier proteins

All cells have a protective barrier that is formed of proteins and a lipid bilayer. What is the name of this barrier?

cell membrane

The fluid mosaic model shown above describes the structure and function of

cell membranes.

Homeostasis is classified under which of the following?

cell regulation

Heatstroke is dangerous to people primarily because

cells can't function properly at high temperatures.

This arrangement within the cell membrane allows it to

control the movement of substances in and out of the cell.

The human respiratory system includes the nose, the larynx, and the lungs. This body system helps maintain homeostasis by

enabling gas exchange in the body.

The ________ essentially aids in cellular homeostasis by providing the main transport mechanism for proteins within the cell.

endoplasmic reticulum

Which of the following types of cellular transport is illustrated in the picture?

exocytosis

Which of the following types of passive transport involves the movement of molecules via special transport proteins?

facilitated diffusion

Which of the following types of passive transport involves the movement of water and solute molecules due to hydrostatic pressure?

filtration

Diffusion is the spontaneous movement of a substance from an area of ___________ concentration to an area of _________ concentration.

higher; lower

The body process that would attempt to return the blood pH to normal so that cells could function properly is called _______.

homeostasis

The mammalian diving reflex is an example of what process?

homeostasis

An organism's ability to maintain a stable internal environment in the midst of external environmental change is known as

homeostasis.

This process is an example of a feedback mechanism that plants use in order to

maintain homeostasis.

The Golgi apparatus helps to maintain cellular homeostasis by

modifying, sorting, and packaging proteins prior to transport.

One way that it causes a response in the body is to activate receptors on muscle cells.

on the cell membrane

Where are these cellular receptors located?

on the cell membrane

Cells can function

only in a narrow range of temperature and pH.

If the water concentration inside a cell is higher than the water concentration outside the cell, water flows out of the cell. This method of molecular transport is called

osmosis

Which of the following types of passive transport involves water molecules moving from a high concentration to a low concentration?

osmosis

How are the small molecules of oxygen and carbon dioxide moving through the cell membrane?

passive transport by diffusion

Which of the following is an example of active transport?

sodium-potassium pump

The cell in diagram 2 has been placed in a solution that contains _______ the interior of the cell.

the same concentration of water as

The cell membrane is a highly selective barrier that controls the movement of substances in and out of the cell. In fact, polar molecules are unable to go across unless

they pass through channels in the cell membrane.

Thus, the basic function of a physiological feedback loop is

to regulate a process.

Which of the following is an example of two or more body systems interacting to maintain homeostasis?

~When body temperature is high, signals from the brain cause increased blood flow to the skin. ~When calcium levels in the blood are low, hormones cause calcium to be released from bones. ~When too much salt is consumed, it is filtered out of the blood by the kidneys and excreted.

In which of the following ways does the body respond to an increase in skeletal muscle cell activity?

~by increasing the heart rate ~by increasing the respiratory rate

The body's ability to maintain a relatively constant internal environment is called homeostasis. This stability can be challenged by

~reduced water or food intake. ~infectious organisms. ~elevated or depressed blood pH. ~extreme temperatures.