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Which term does not belong polarity basement membrane regeneration possible vascular cell to cell junctions?
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Do epithelial tissues always exhibit polarity?
Yes, epithelial tissues typically exhibit polarity, with distinct apical and basal surfaces. The apical surface faces the external environment or a body cavity, while the basal surface is anchored to a basement membrane. This polarity allows for the specialized functions of epithelial cells, such as secretion and absorption.
What is membrane polarity?
-70 mV this potential difference in a resting neuron (Vr) is called the resting membrane potential, and the membrane is said to be polarized.
Why does the polarity of a cell membrane reverse during an action potential?
The reversal of polarity during an action potential is due to the changes in ion concentrations across the cell membrane. When the membrane depolarizes, sodium ions rush into the cell and make the inside more positive. Repolarization occurs when potassium ions leave the cell, bringing the membrane potential back to negative.
What are 6 special characteristics of epithelium?
1. Cellularity: composed entirely of cells 2. Polarity: Apical vs. Basal Surface 3. Specialized Contacts: special cell junctions (Tight, Gap and Desmosomes) 4. Avascular but Innervated: contains NO blood vessels but has nerve endings 5. Regeneration: high regenerative capacity 6. Deep in Epithelia, there's always Connective Tissue
What is a factor that determines whether molecule can cross a cell membrane?
size/ polarity can be the factors
What are the characteristics of epithelia tissue?
Epithelial tissue is composed of tightly packed cells that form a continuous layer to cover body surfaces or line internal cavities. It serves as a protective barrier, regulates the exchange of substances, and can be specialized for functions like secretion, absorption, and sensation. Epithelial cells are often polarized, with distinct apical and basal surfaces.
Do epithelial tissues always exhibit polarity?
Yes, epithelial tissues typically exhibit polarity, with distinct apical and basal surfaces. The apical surface faces the external environment or a body cavity, while the basal surface is anchored to a basement membrane. This polarity allows for the specialized functions of epithelial cells, such as secretion and absorption.
Which of the following factors does not affect membrane permeability?
The presence of membrane proteins does not directly affect membrane permeability. Membrane proteins mainly play a role in transport, signaling, and cell recognition rather than impacting the permeability of the membrane itself.
What is a factor that determines of a molecule can cross a cell membrane?
Polarity
How is the cell membrane selectively permeable?
The pores of the cell membrane only allow objects of a certain size or polarity through. The lipids that make up the membrane have a certain polarity at the head and tail and only certain objects are allowed through because of this.
Which is a factor that determines wether a molecule can cross the cell membrane?
Polarity
What is membrane polarity?
-70 mV this potential difference in a resting neuron (Vr) is called the resting membrane potential, and the membrane is said to be polarized.
Why does the polarity of a cell membrane reverse during an action potential?
The reversal of polarity during an action potential is due to the changes in ion concentrations across the cell membrane. When the membrane depolarizes, sodium ions rush into the cell and make the inside more positive. Repolarization occurs when potassium ions leave the cell, bringing the membrane potential back to negative.
What is a factor that determines whether a molecule cross a cell membrane?
size/ polarity can be the factors
What are 6 special characteristics of epithelium?
1. Cellularity: composed entirely of cells 2. Polarity: Apical vs. Basal Surface 3. Specialized Contacts: special cell junctions (Tight, Gap and Desmosomes) 4. Avascular but Innervated: contains NO blood vessels but has nerve endings 5. Regeneration: high regenerative capacity 6. Deep in Epithelia, there's always Connective Tissue
What is a factor that determines whether molecule can cross a cell membrane?
size/ polarity can be the factors
What will happen in certain tissues without tight junctions?
Without tight junctions, there will be an increase in paracellular transport of molecules between cells, compromising the selective barrier function of the tissue. This can lead to leakage of ions, toxins, and pathogens through the intercellular spaces, potentially causing tissue damage, inflammation, and loss of cellular polarity and function.
