PNB 2264 Final Cumulative UPDATED ACTUAL Exam Questions and CORRECT Answers
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Course
PNB 2264
Institution
PNB 2264
PNB 2264 Final Cumulative UPDATED
ACTUAL Exam Questions and CORRECT
Answers
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. Diffusi...
PNB 2264 Final Cumulative UPDATED
ACTUAL Exam Questions and CORRECT
Answers
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 ANSWER- ✔✔D. Tissues are made up of cells and organs
are made up of tissues
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 ANSWER- ✔✔A. Cause a rapid
change in the body
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 ANSWER- ✔✔B. Stimulus; receptors; the
efferent pathway
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
Extracellular fluid consists of
A. Blood plasma
B. The fluid between cells
C. The fluid inside cells
D. Both A and B - CORRECT ANSWER- ✔✔D. Both A and B
The elbow is _______ to the wrist.
A. Lateral
B. Medial
C. Distal
D. Proximal
E. Dorsal - CORRECT ANSWER- ✔✔D. Proximal
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 ANSWER- ✔✔B. They contain polar heads and non-polar
tails
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 ANSWER-
✔✔B. The antiport of sodium and potassium ions by the Na+/K+ pump
A cell is taken out of the body and placed into a test solution. The concentration of solute X
in the test solution is 100mM, and the concentration of solute X inside the cell is 200mM.
The cell membrane is permeable to water but not solute X. Which of the following statements
is/are true?
A. There is a net flux of water out of the cell
B. The test solution is hypertonic
C. There is flux of water molecules into and out of the cell
D. All of the above are true - CORRECT ANSWER- ✔✔C. There is flux of water molecules
into and out of the cell
The intervertebral disks are composed of _________ and connect ____________ .
A. Dense regular connective tissue; vertebral bodies
B. Fibrocartilage; spinous processes of cervical vertebrae
C. Fibrocartilage; vertebral bodies
A key difference between carriers/transporters and ion channels is that:
A. Carriers are selective, whereas ions channels are usually non-specific
B. Carriers require a concentration gradient, whereas ion channels do not
C. Carriers always consume ATP, but ion channels may or may not consume ATP
D. Carriers are saturable, whereas channels are not - CORRECT ANSWER- ✔✔D. Carriers
are saturable, whereas channels are not
Which is NOT a feature of cartilage?
A. Avascular
B. Cells
C. Glycosaminoglycan molecules
D. Hemidesmosomes
, E. Protein fibers - CORRECT ANSWER- ✔✔D. Hemidesmosomes
Which of the following situations best represents a homeostatic mechanism?
A. A person who becomes very nervous begins to sweat.
B. After going outside on a hot day, the core body temperature increases.
C. After eating a large batch of salty popcorn, levels of salt in the urine increase.
D. As age increases, the amount of calcium in bones tends to decrease.
E. All of the above represent homeostatic mechanisms. - CORRECT ANSWER- ✔✔C. After
eating a large batch of salty popcorn, levels of salt in the urine increase.
The matrix of hyaline cartilage features __________ .
A. Chondroitin sulfate
B. Collagen fibers
C. Both of the above
D. Neither of the above - CORRECT ANSWER- ✔✔C. Both of the above
Which feature is found in growing long bones?
A. Hydroxyapatite
B. Osteoclasts
C. Hyaline cartilage
D. All of the above - CORRECT ANSWER- ✔✔D. All of the above
Which of the following lists the events of endochondral bone formation in the correct
sequence? (Note: Some steps may be missing.)
A. Periosteal bud formation, epiphyseal line formed, marrow cavity forms, primary center of
ossification
B. Cartilage cells die, periosteal bud formation, osteoblasts secrete osteoid, secondary center
of ossification
C. Epiphyseal disk is formed, primary center of ossification, osteoblasts secrete osteoid,
secondary center of ossification.
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