Check Your Understanding Questions Homeostasis & Physiology Flashcards
What are the three components of the “generalized cell?”
Nucleus, Plasma Membrane, Cytoplasm
Define hydrophobic and hydrophilic. Describe how the properties of the cell membrane affect its permeability.
Hydrophobic: Water-Fearing, Non-Polar tail of the pbl
Hydrophilic: Water-Loving, polar head of pbl
Phospholipid bilayer is selcetively permeable creates a passage that prevents hydrophilic molecules from crossing the membrane
What is the key difference between active and passive membrane transport?
Active transport uses energy and moves molecules from low to high concentration
Passive transport does not use energy and moves molecules from high to low concentration
What is the difference between endocytosis and exocytosis?
Endocytosis is the process by which something enters the cell after attaching to the membrane and is stored in a vesicle
Exocytosis is the expelling of contents from the cell into the extracellular environement
What is the key function of the mitochondria? What cell type has more mitochondria than the average cell?
Muscle cell have more mitochondria beacuse that is where ATP is made and ATP is needed for muscle contraction
Where are ribosomes made?
in the nucleolus
Differentiate between the functions of microfilaments, intermediate filaments and microtubules.
Microfilaments are primarily responsibel for cell structure and shape
Intermediate Filaments resis pulling forces on the cell
Microtubles decide on the overall distribution of organelles in the cell
What is unique about a red blood cell in terms of its organelles?
RBC’s do not contain a nucleus, mitochondira, ER, etc.
What are two functions of epithelium?
Protect and Support
Filter
Absorbtion & Secretion
Identify two organs that epithelium would be found.
Lungs, Kidneys, Intestines
What type of epithelial cell is found in the alveoli of the lungs?
simple squamous
Compare and contrast cardiac, smooth and skeletal muscle.
Skeletal is Voluntary
Cardiac and Smooth are Involuntary
Skeletal is Multi-Nucleated
Cardiac is uni/bi-nucleated
Smooth is uninucleated
Skeletal is Striated
Cardiac is Striated + Intercelated discs
Smooth has no striations
Differentiate between axons and dendrites.
A Neuron has one axon that sens infromation, but hundreds of dendrites that all recieve information
Where is the axon hillock found?
The axon hillock is located at the junction between the cell body (soma) and the axon of a neuron
