Today In Biology We...
- took a quiz
- Curtis lied about the quiz result charts being fixed
- got our labs back
- learned about the one tracked minds of boy's sperm
- took some notes
- played a fun revealing-thinger game
Here are the notes that we took today!
THE CYTOSKELETON
cytoskeleton- a network of fibers throughout the cytoplasm that forms a dynamic framework for support and movement and regulation.
microfilaments- also called actin filaments; provide cellular support; participate in muscle contraction; and responsible for localized contraction of cells
CELL SURFACES AND JUNCTIONS
- gives mechanical support to the cell and helps maintain its shape.
- enables a cell to change shape in an adaptive manner
- associated with motility by interacting with specialized proteins called motor molecules
- plays a regulatory role bu mechanically transmitting signals from cell's surface to it's interior
The 3 types of fibers in the cytoskeleton are shown above in the beautiful picture and explained below
microtubules- straight hollow fibers about 25nm in diameter and 200nm in length; constructed from the globular proteins called tubulin. Examples would include:
- centrioles: pair of cylindrical structures located in the centrosomes of an animal cell, composed of nine sets of triplet microtubules arranged in a ring.
- cilia and flagella: locomotor oraganelles found in eukaryotic cells that are formed from a specialized arrangement of microtubules.
microfilaments- also called actin filaments; provide cellular support; participate in muscle contraction; and responsible for localized contraction of cells
- helps with the elongation and contaction of psuedopodia druring amoeboid movement
CELL SURFACES AND JUNCTIONS
Plant cells produce coats external to the plasma membrane.
cell wall-protects the plants and gives support; contains cellulose
extracellular matrix- (EMC) meshwork of marcomolecules outside the plasma membrane of animal cells, locally secreted by cells; provides support and anchorage fro the cells
plasmodesmata- channels that perforate plant cell walls through which cytoplasmix strands communicate between adjectent cells.
tight junction-intercellular junction that holds cells together tightly enough to black transport of substances through the intercellular space.
desosomes- intercellular junctions that rivet cells together into strong sheets, but still permit substances to pass freely
gap junction-intercellular junction specialized fro material transport etween the cytoplasm of adjacent cells.
Okay that's it! Don't forget about your vocab this weekend!
cell wall-protects the plants and gives support; contains cellulose
extracellular matrix- (EMC) meshwork of marcomolecules outside the plasma membrane of animal cells, locally secreted by cells; provides support and anchorage fro the cells
plasmodesmata- channels that perforate plant cell walls through which cytoplasmix strands communicate between adjectent cells.
tight junction-intercellular junction that holds cells together tightly enough to black transport of substances through the intercellular space.
desosomes- intercellular junctions that rivet cells together into strong sheets, but still permit substances to pass freely
gap junction-intercellular junction specialized fro material transport etween the cytoplasm of adjacent cells.
Okay that's it! Don't forget about your vocab this weekend!
2 comments:
great use of the textbook images. Very thorough. Your cytoskeleton image actually showed the mitochondria and other organelles suspended just like the question on the quiz today.
Thanks Meg (right?) :) after being away this really helped me prepare for my make up quiz- great job!
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