Guided Reading Plasma membrane page 71-72



Guided Reading Plasma membrane section 7.2

1. The _______________ is the flexible boundary of a cell that separates a cell from its surroundings. It allows __________ to enter the cell and _____________ to be removed. Keeping this balance is called _______________.

2. To keep this balance the cell membrane allows some molecules to enter the cell and keeps other out, this is called _______________ ______________.

3. A ________________ is made up of glycerol, two fatty acids and a phosphate group. The plasma membrane is made up of __________ layers of _________________ arranged back to back called a _____________ layer.

4. The 2 phospholipid layers are arranged so the ________ heads are facing out and the _________ tails are facing in.

5. The phospholipid bilayer makes a barrier that is ___________ on the outside and ____________ on the inside. This arrangement makes it so it is harder for ___________________ molecules to move through the membrane.

6. The organization of the plasma membrane is called a ___________ ____________ model.

Guided reading Cell Transport section 8.1

1. The plasma membrane is ____________ __________meaning only certain molecules can pass in and out of the cell.

2. ____________ is the only substance the plasma membrane always allows in or out. The movement of water from an area of ________ concentration to an area of __________ concentration is called _____________.

3. In a ____________ solution water moves in and out of the cell at the same rate this allows cells to keep __________ shape.

4. In a ____________ solution more water enters the cell than leaves so the cell will _____________.

5. In a ____________ solution more water leaves the cell than enters, so the cell will ___________.

6. When a cell uses no energy to move substances through its membrane it is called ______________ transport.

7. When special proteins in the plasma membrane move help move large molecules across the membrane the process is called ______________ _____________.

8. In __________________- _______________ particles are moved across the cell membrane against a force. So the substance moves from an area of ___________ concentration to an area of _____________ concentration. This process requires ________________.

9. _________________ is a process in which a cell engulfs large molecules and takes them into the cell. _______________ is the reverse of endocytosis.

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Use p. 177-178 in your Biology textbook to label and color-code each of the following:

|Part |Color |Function |

|Polar head | | |

| | | |

|Nonpolar tail | | |

| | | |

|Carbohydrate chains | | |

| | | |

|Membrane transport proteins | | |

|Cholesterol | | |

| | | |

|Phospholipid bilayer | | |

| | | |

Homeostasis within an organism

Use the following concept maps to illustrate how organisms maintain homeostasis, the internal balance, of water, blood glucose and temperature.

1. Temperature (p. 896)

2. Blood Glucose (p. 932)

3. Water (p. 931)

-----------------------

Blood vessels ___________

Blood flow _____________

Body heat is ____________

Glands produce _________, which dries on the skin.

Blood vessels ___________

Blood flow _____________

Body heat is ____________

Body temperature falls

Body temperature rises

Liver and muscles take in _________

Pancreas releases __________

Eat food

Blood glucose levels ______

Liver cells release __________

Pancreas releases __________

Blood glucose levels _____

Work out and sweat

_________ water in your blood

________________ senses concentration of _________ in your blood

It stimulates __________ gland to make _________.

Blood water level ________.

ADH causes kidney cells to reabsorb _________ from _____________.

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