PNB 2264: Exam 1 Practice Questions and Solutions.
Choose the answer that best illustrates hierarchy of organization.
A) Blood levels of glucose are maintained within narrow limits
B) Organs are made up of molecules and tissues are made up of organ systems
C) Diffusion occurs down a concentration gradient
D) Tissues are made up of cells and organs are made up of tissues
E) All of the above correct answers D
The purpose of positive feedback mechanisms is to __________ .
A) Cause a rapid change in the body
B) Anticipate changes in the environment.
C) Return a variable toward the set point.
D) Maintain a relatively constant internal environment.
E) Detect changes in the external environment correct answers A
Your body temperature rises, this _________ is sensed by _________and in response
information is carried by _________ to activate the secretion of sweat.
A) Set point; receptors; the efferent pathway
B) Stimulus; receptors; the efferent pathway
C) Stimulus; the brain; the afferent pathway
D) Set point; receptors; effectors
E) Feedback; the brain; receptors correct answers B
If your body temperature decreases, ________ will bring it back up and if your body temperature
increases, ________ will bring it back down.
A) Negative feedback; negative feedback
B) Positive feedback; positive feedback
C) Negative feedback; positive feedback
, D) Positive feedback; negative feedback correct answers A
Extracellular fluid consists of
A) Blood plasma
B) The fluid between cells
C) The fluid inside cells
D) Both A and B correct answers D
The elbow is _______ to the wrist.
A) Lateral
B) Medial
C) Distal
D) Proximal
E) Dorsal correct answers D
Phospholipids, a major component of the lipid bilayer, are classified as amphipathic molecules
because:
A) They contain hydrophilic fatty acid residues and hydrophobic phosphates
B) They contain polar heads and non-polar tails
C) They are able to interact with water
D) All of the above correct answers B
Which of the following is NOT an example of passive transport?
A) Transport of oxygen across the respiratory membrane
B) The antiport of sodium and potassium ions by the Na+/K+ pump
C) Movement of water molecules into a hypertonic solution
D) Calcium entering the cell through a ligand gated ion channel correct answers B
Choose the answer that best illustrates hierarchy of organization.
A) Blood levels of glucose are maintained within narrow limits
B) Organs are made up of molecules and tissues are made up of organ systems
C) Diffusion occurs down a concentration gradient
D) Tissues are made up of cells and organs are made up of tissues
E) All of the above correct answers D
The purpose of positive feedback mechanisms is to __________ .
A) Cause a rapid change in the body
B) Anticipate changes in the environment.
C) Return a variable toward the set point.
D) Maintain a relatively constant internal environment.
E) Detect changes in the external environment correct answers A
Your body temperature rises, this _________ is sensed by _________and in response
information is carried by _________ to activate the secretion of sweat.
A) Set point; receptors; the efferent pathway
B) Stimulus; receptors; the efferent pathway
C) Stimulus; the brain; the afferent pathway
D) Set point; receptors; effectors
E) Feedback; the brain; receptors correct answers B
If your body temperature decreases, ________ will bring it back up and if your body temperature
increases, ________ will bring it back down.
A) Negative feedback; negative feedback
B) Positive feedback; positive feedback
C) Negative feedback; positive feedback
, D) Positive feedback; negative feedback correct answers A
Extracellular fluid consists of
A) Blood plasma
B) The fluid between cells
C) The fluid inside cells
D) Both A and B correct answers D
The elbow is _______ to the wrist.
A) Lateral
B) Medial
C) Distal
D) Proximal
E) Dorsal correct answers D
Phospholipids, a major component of the lipid bilayer, are classified as amphipathic molecules
because:
A) They contain hydrophilic fatty acid residues and hydrophobic phosphates
B) They contain polar heads and non-polar tails
C) They are able to interact with water
D) All of the above correct answers B
Which of the following is NOT an example of passive transport?
A) Transport of oxygen across the respiratory membrane
B) The antiport of sodium and potassium ions by the Na+/K+ pump
C) Movement of water molecules into a hypertonic solution
D) Calcium entering the cell through a ligand gated ion channel correct answers B
