Week 1 - Cell Membrane Transport Flashcards
Homeostasis is continually being disrupted by ____ and _____ stimuli, examples of which include _____
external
internal
heat, cold, lack of oxygen
psychological stress, exercise
The body maintaines homeostasis by influencing which organ system(s)?
nervous
endocrine
The components of a feedback loop are ________
receptor
control center
effector
In a negative feedback loop, the original stimulus is ______
reversed
In a positive feedback loop, the original stimulus is _______ and requires an additional ________
intensified
control mechanism
The lipid bilayer of the cell membrane consists of _________
phospholipids cholesterol integral proteins glycolipids peripheral proteins
List functions of membrane proteins
Formation of channel transporter protein receptor protein cell identity marker linker act as enzyme
Fluidity of the cell membrane is reduced by presence of ________
cholesterol
List types of transport across plasma membrane
mediated transport non-mediated transport active transport passive transport vesicular transport
How will each of the following affect rate of diffusion:
1) Higher temperature
2) larger size of diffusing substance
3) increase in surface area
4) increasing diffusion distance
5) lower concentration gradient
1) faster
2) slower
3) faster
4) slower
5) slower
Osmosis is _______
the net movement of water through a selectively permeable membrane from an area of high water concentration to an area of lower water concentration
In a ____ solution, higher concentration of water outside of the cell results in hemolysis
Hypotonic
In a ____, solution, lower concentration of water outside of the cell results in _____
Hypertonic
crenation
List modes of passive transport across cell membrane
diffusion through lipid bilayer
diffusion through membrane channel
facilitated diffusion
40% of ATP in a cell is used for ________
primary active transport
Secondary active transport is ______
a type of active transport where a transporter protein couples the movement of an ion (typically Na+ or H+) down its electrochemical gradient to the uphill movement of another molecule or ion against a concentration/electrochemical gradient
What is pinocytosis?
a mode of endocytosis in which small particles, primarily extracellular fluids, are brought into the cell, forming an invagination, and then suspended within small vesicles
Cells that are active in exocytosis would likely contain many ______ (organelle)
Golgi bodies
Transport proteins w/in the cell membrane are required to transport a substance across a membrane via ______
facilitated diffusion
