Chapter 3 Flashcards
The cell membrane is impermeable to:
ions and large, uncharged molecules (like glucose)
Facilitated diffusion can be __ or __ mediated.
channel or carrier
Endocytosis is…
a process by which cells absorb external material by engulfing it with the cell membrane
Exocytosis is…
the fusion of secretory vesicles with the plasma membrane resulting in the discharge of vesicle content into the extracellular space
Transcytosis is…
the receptor-mediated uptake of a ligand on one side of the cell, vesicular transport across the cell, and exocytosis of the vesicle contents on the opposite side
High water concentration moves to areas of lower concentration via…
simple diffusion & aquaporins (water channels)
What will happen to a RBC in a hypotonic solution?
What about a hypertonic solution?
hypotonic: cell will swell (higher concentration of solutes INSIDE the RBC = water will flow in)
hypertonic: cell will shrink
Blast =
Cyte =
blast = young cell, reproduces cyte = mature cell, does not reproduce
Cytoplasm has two components:
cytosol and organelles/inclusions
Cytosol makes up __% of the cell and is __% water
55%, 75-90% water
What will happen to a cell in an ISOTONIC solution?
it will maintain its shape
A cell in a hypertonic solution will…
shrink
The most abundant cation in the INTRACELLULAR fluid is…
K+
The most abundant cation in the EXTRAcellular fluid is…
Na+
A normal human DIPLOID cell contains __ chromosomes in the nucleus.
23
