Cell Transport and Homeostasis

Most cellular processes can only occur within a very narrow pH range.  What substance regulate an organism's pH so it can maintain homeostasis?

• acids
• bases
• neutralizers
• buffers

Tags

NGSS.HS-LS1-3

In order to maintain homeostasis, human cells must have a higher concentration of sodium ions outside the cell than inside the cell.  In addition, the concentration of potassium ions must be higher inside the cell than outside the cell.  Which of the following forms of cell transport helps human cells maintain their sodium/potassium concentration?

• passive transport
• diffusion
• osmosis
• cell membrane pump

Tags

NGSS.HS-LS1-3

Organisms must be able to adapt to a changing external and internal environment.  An organism's ability to maintain a stable internal environment is known as homeostasis.  
How does a cell's membrane help an organism maintain homeostasis?

• cell membranes directly control the temperature of the cell
• cell membranes protect the cell organelles from large doses of radiation
• cell membranes control the substances that enter or leave cells
• cell membranes use a large portion of the cell's energy supply

Tags

NGSS.HS-LS1-3

Living organisms are only able to function and thrive if they can maintain constant or stable internal conditions.  This ability is known as ____.

• natural selection
• endocytosis
• cell differentiation
• homeostasis

Tags

NGSS.HS-LS1-3

Although this mechanism uses energy, it is necessary to maintain these conditions so nerve impulses can be transmitted properly. 
Which of the following statements does this information BEST support?

• energy is generated during most of the process that occur in living organisms
• evolution has increased the number of non-essential processes in living organisms
• organisms that are living today use more energy than their ancestors
• living organisms have processes and structures to help them maintain homeostasis

Tags

NGSS.HS-LS1-3

Homeostasis refers to the necessity of an organism to maintain constant or stable internal conditions.  What structure helps cell maintain homeostasis by regulation the movement of materials into and out of a cell?

• nuclear membrane
• chloroplast
• mitochondrion
• cell membrane

Tags

NGSS.HS-LS1-3

During heatstroke, the body can't dispose of excess heat.  As a result, the homeostatic balance is disturbed, and internal body temperatures can reach as much as 110 degrees Fahrenheit.  
Heat stroke is dangerous to people primarily because...

• blood pressure becomes too low
• cells cannot function properly at high temperatures
• blood vessels may rupture
• it causes pneumonia

Tags

NGSS.HS-LS1-3

Cell can function...

• in rapidly changing temperatures and pHs.
• only in narrow range of temperatures and pHs.
• in a wide range of pHs and temperatures
• at any temperature and pH.

Tags

NGSS.HS-LS1-3

Emphysema is a health condition in which the lungs can no longer expel carbon dioxide normally.  As a result, a person who has emphysema may have high blood acidity levels.
The body process that would attempt to return the blood pH to normal so that cell can function properly is called ____.

• homeostasis
• adaptation
• acidosis
• active transport

Tags

NGSS.HS-LS1-3

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

• solute will flow into the cell from the surrounding environment
• water will flow out of the cell and into the surrounding environment
• water will flow into the cell from the surrounding environment
• nothing will change-- it is already in equilibrium