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Physiology Test #1
BIOS3500 Test #1
50
Physiology
Undergraduate 3
12/09/2011

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Cards

Term
Which statement concerning negative feedback is correct?
Definition
Negative feedback exists when a change in a regulated variable triggers a response that opposes the change.
Term
What does a membrane potential of +30mV represnt?
Definition
There is a charge difference of +30mV across the palsma membrane and the inside of the cell is more positive compared to the outside.
Term
Which statement regarding membrane proteins is incorrect?
Definition
CAMs serve as binding sites for specific ligands (agonists).
Term
Which sequence represents the correct hierarchy of biological organization?
Definition
cell-tissue-organ-system-organism
Term
_______ are physical adhering junctions, _______ are communicating junctions that allow the passage of ions from one cell to another and _____ are impermeable junctions that prevent any molecules from passing between cells.
Definition
Desmosomes, gap junctions, tight junctions
Term
If a typical body cell is placed in a hypertonic solution, the cell will...
Definition
Lose water.
Term
The Nernst Equation:
Definition
Is used to calculate the resting membrane potential of a permeable ion.
Term
Which of the statements concerning the plasma membrane is incorrect?
Definition
The proteins found on the extracellular side of the plasma membrane match the proteins found on the cytoplasmic side of the plasma membrane.
Term
Select the incorrect statement about connective tissue.
Definition
It consists of densely packed cells within extracellular material.
Term
Which of the following is not a function of membrane proteins?
Definition
They serve to modify the fluidity of the membrane.
Term
Which of the following body systems is not involved in maintaining homeostasis?
Definition
Reproductive system
Term
Which extracellular fiber does not develop in scurvy?
Definition
Collagen.
Term
Diffusion results from...
Definition
Inherent thermal motion.
Term
Select the incorrect statement about membrane permeability and ion potential.
Definition
The large proteins in the cytoplasm that contains negative charge are permeable.
Term
Which of the following substances is most likely to passively diffuse across the plasma membrane?
Definition
A nonpolar molecule.
Term
The hormone insulin is released whe there's an increase of blood glucose.  Insulin enhances the transport of glucose from the blood into most of the body's cells.  If its secretion was regulated by a positive-feedback system, which of the following statements is correct?
Definition
An increase in blood glucose concentration stimulates insulin secretion, which further increases the blood glucose concentration.
Term
Receptor sites for neurotransmitters or hormones on the outer surface of the plasma membrane are made of:
Definition
Proteins.
Term
The resting membrane potential of a typical nerve cell.
Definition
-70mV
Term
Assuming a membrane is only water soluble and there is no significant hydrostatic pressure, water will osmose from...
Definition
A hypotonic solution to a hypertonic solution.
Term
Which of the following does not require energy expenditure?
Definition
Potassium efflus through leak channels.
Term
Which of the following is a mechanistic rather than a teleological explanation of a physiological phenomenon?
Definition
A person's stomach secretes digestive juices because it is stimulated by the food entering the stomach and activation of the nervous system.
Term
By osmosis, water always moves to an area of higher...
Definition
solute concentration
Term
Which of the following statements concerning phospholipids is incorrect?
Definition
Can combine with proteins to produce glycoproteins.
Term
Ion that is the major contributor to formation of the resting membrane potential...
Definition
K+
Term
The ion that has the highest permeability at resting membrane potential...
Definition
K+
Term
Ion that is actively transported out of the cell at rest to maintain the resting membrane potential...
Definition
Na+
Term
Anion in greatest concentration in the ICF (intracellular fluid).
Definition
A-
Term
The resting membrane potential is closest to te equilibrium potential of which ion?
Definition
K+
Term
Ion whose equilibrium potential is opposite in charge of the resting membrane potential...
Definition
Na+
Term
The negative anion that has a high concentration outside of the cell.
Definition
Cl-
Term
This tissue type is made up of cells specialized in the exchange of materials between the cell and its environment...
Definition
Epithelial cells.
Term
Tissue responsible for initiation and transission of electrical signals...
Definition
Nervous tissue.
Term
Skeletal, cardiac, and smooth are types of this tissue...
Definition
Muscle tissue
Term
This tissue type connects, supports, and anchors various body parts...
Definition
Connective tissue.
Term
The heart is made of this type of tissue...
Definition
Muscle tissue.
Term
This tissue type is composed of cells specialized for contraction and moving limbs...
Definition
Muscle tissue.
Term
Electrical gradient for K+ at resting potential...
Definition
Ion tends to be move into the cell by this force.
Term
Concentration gradient for Na+ at resting potential...
Definition
Ion tends to be move into the cell by this force.
Term
Concentration gradient for K+ at resting potential...
Definition
Ion tends to be move out of the cell by this force.
Term
Electrical gradient for Na+ at resting potential.
Definition
Ion tends to be move out of the cell by this force.
Term
Provides tensile strength.
Definition
Collagen.
Term
Enable tissue to stretch and recoil.
Definition
Elastin.
Term
Promotes cell adhesion.
Definition
Fibronectin.
Term
Is a cell that produces fibers in the extracellular matix...
Definition
Fibroblast.
Term
Facilitated diffusion is a passive process... (t/f)
Definition
True
Term
Surface carbohydrates in the plasma membrane serve as glycoproteins or glycolipids that act to attract "like" cells for tissue formation... (t/f)
Definition
True
Term
Homeostatic mechanisms operate primarily on the principle of negative feedback... (t/f)
Definition
True.
Term
Exocrine glands produce secretions that are released through ducts to be deposited into a lumen.
Definition
True.
Term
Phosphorylation of a carrier can alter the affinity of its binding sites, accompanied by a change in its confromation... (t/f)
Definition
True
Term
All molecule emit energy that cause continuous random motion unless they are in equilibrium in a solution... (t/f)
Definition
False
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