increases the fluidity of the membrane at all temperatures. decreases the fluidity of the membrane at hot temperatures. helps attach the membrane to the cytoskeleton. helps keep integral proteins in the membrane. makes the organism more susceptible to circulatory disorders.
increases the fluidity of the membrane at all temperatures. decreases the fluidity of the membrane at hot temperatures. helps attach the membrane to the cytoskeleton. helps keep integral proteins in the membrane. makes the organism more susceptible to circulatory disorders.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:**The Role of Cholesterol in Animal Cell Membranes**
The presence of cholesterol in the cell membranes of some animals can influence membrane dynamics in various ways. Here are some key points regarding its functions:
- **Increases Membrane Fluidity at All Temperatures**: Cholesterol can make the membrane more flexible, allowing molecules to move more easily within it.
- **Decreases Membrane Fluidity at Hot Temperatures**: At higher temperatures, cholesterol can provide stability to the membrane, preventing it from becoming too fluid.
- **Helps Attach the Membrane to the Cytoskeleton**: Cholesterol may play a role in anchoring the membrane to the cytoskeletal structure inside the cell.
- **Helps Keep Integral Proteins in the Membrane**: Cholesterol can assist in maintaining the position and function of integral proteins, which are crucial for membrane function.
- **Makes the Organism More Susceptible to Circulatory Disorders**: High levels of cholesterol can lead to health issues related to circulation.
In this context, the highlighted option is "helps keep integral proteins in the membrane," indicating the significance of cholesterol in maintaining the structural integrity and functionality of cell membranes.
Expert Solution
Step 1
The presence of cholestrol in the cell membrane of some animals helps to keep the integral proteins in the membrane.
The studies shows that the cell membrane is composed of the lipids that are arranged in a bilayer . Also the lipids are arranged withinnthe membrane with the polar head towards the outer sides and the hydrophobic tails towards the inner part . This ensures that the non polar tail of the saturated hydrocarbon is protected from the aqueous environment. The lipid components of the membrane comprises the phosphoglycerides and the cholestrol .
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