Plasma MB and Homeostasis review

Label this image of a plasma membrane.

a

b

c

d

e

phospholipid bilayer

integral protein

hydrophilic head

glycoprotein

glycolipid

Match the following jobs of membrane proteins to their description.

• where extracellular molecules can bind

• cell identification protein

• allows passage of substances through PMB

• receptor protein

• catalyzes a reaction of some sort

• transport protein

• tells your immune syst. that this is YOU

• enzyme (protein)

• holds neighboring cells together

• cell to cell adhesion protein

Match the following images of various types of MB proteins to their roles.

• transport protein

• 
• enzyme

• 
• cell adhesion

• 
• receptor

• 
• identity marker

• 

Identify the components of a feedback loop using the labels given.

a

b

c

d

e

f

control center

receptor

stimulus

effector

output

input

Tags

NGSS.HS-LS1-2

NGSS.HS-LS1-3

The vast majority of feedback loops in the body are NEGATIVE feedback loops.

• TRUE

• FALSE

Tags

NGSS.HS-LS1-3

When referring to feedback loops, NEGATIVE means

• an undesirable response; bad

• the response is to "negate" the problem (do the opposite)

• someone has a bad attitude

Tags

NGSS.HS-LS1-3

When referring to feedback loops, POSITIVE means

• a desirable response; good

• someone has a great attitude

• the response in to encourage or promote the original change

Tags

NGSS.HS-LS1-3

Select the 2 terms that refer to the same watery fluid.

• Cytosol

• extracellular fluid

• intracellular fluid

• cytoplasm

Can the solutes in the cytosol be in different concentrations than the same solutes in the extracellular fluid?

• NO. The job of the cell's membrane is to maintain equilibrium across the MB.

• Yes. That is the purpose of the MB; to create the correct environment for the cell.

Answer explanation

We would cease to exist if the solute concentrations were identical inside and outside of the cell. We NEED the concentration differences (called gradients) in order to send nerve impulses and achieve muscle contraction.

Tags

NGSS.HS-LS1-3