BIOL 1108 EXAM 4 UPDATED 2026
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS – YOUR
ROAD TO SUCCESS
Homeostasis and Regulation
Q: What is Homeostasis and how is it maintained? A: Homeostasis is the
process by which organisms maintain a relatively stable internal environment
despite changes in the external world. This is achieved through a regulatory system
involving:
Set Point: The ideal normal value for a physiological variable (like body
temperature or blood glucose).
Receptor: The component that senses changes in the environment or
stimuli.
Control Center: The component (often the brain) that processes the
information from the receptor and signals the effector to respond.
Effector: The component that carries out the physical change to return the
system to the set point.
Q: What are Feedback Loops? A: Feedback loops are biological mechanisms
where the outputs of a system act as inputs for another part of the system,
eventually looping back to influence the original process.
Note: Negative feedback loops work to reverse a change (returning to the set
point), while positive feedback loops amplify a change.
Cellular Processes and Integumentary System
Q: How does Passive Transport work? A: Passive transport is the movement of
substances across a cell membrane without the use of cellular energy (ATP).
This movement occurs naturally along a concentration gradient, from an area of
high concentration to low concentration.
, Q: What are Apocrine Sweat Glands? A: These glands are abundant in hair
follicles (specifically in the armpits and groin). Unlike eccrine sweat, the secretions
from apocrine glands are odorless until bacteria on the skin feed on the
secretions, which produces what we recognize as body odor.
Fertility rates -ANSWER✔✔Average number of children a woman will have
during her childbearing years
pulse oximeter -ANSWER✔✔an external monitor placed on the patient's finger or
earlobe to measure the oxygen saturation level in the blood
Erythrocyte -ANSWER✔✔Carry oxygen from lungs and deliver it to the body
Protodonata -ANSWER✔✔largest insects that ever lived
Pre-eclampsia -ANSWER✔✔Serious blood pressure conditions that develops
during pregnancy
Haplotype -ANSWER✔✔Set of DNA variants along a single chromosome that
tend to be inherited together because they are close to each other on the
chromosome
Species demarcation -ANSWER✔✔Not having successful progeny
Heterotherms -ANSWER✔✔Body temperature varies depending on the
environment
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS – YOUR
ROAD TO SUCCESS
Homeostasis and Regulation
Q: What is Homeostasis and how is it maintained? A: Homeostasis is the
process by which organisms maintain a relatively stable internal environment
despite changes in the external world. This is achieved through a regulatory system
involving:
Set Point: The ideal normal value for a physiological variable (like body
temperature or blood glucose).
Receptor: The component that senses changes in the environment or
stimuli.
Control Center: The component (often the brain) that processes the
information from the receptor and signals the effector to respond.
Effector: The component that carries out the physical change to return the
system to the set point.
Q: What are Feedback Loops? A: Feedback loops are biological mechanisms
where the outputs of a system act as inputs for another part of the system,
eventually looping back to influence the original process.
Note: Negative feedback loops work to reverse a change (returning to the set
point), while positive feedback loops amplify a change.
Cellular Processes and Integumentary System
Q: How does Passive Transport work? A: Passive transport is the movement of
substances across a cell membrane without the use of cellular energy (ATP).
This movement occurs naturally along a concentration gradient, from an area of
high concentration to low concentration.
, Q: What are Apocrine Sweat Glands? A: These glands are abundant in hair
follicles (specifically in the armpits and groin). Unlike eccrine sweat, the secretions
from apocrine glands are odorless until bacteria on the skin feed on the
secretions, which produces what we recognize as body odor.
Fertility rates -ANSWER✔✔Average number of children a woman will have
during her childbearing years
pulse oximeter -ANSWER✔✔an external monitor placed on the patient's finger or
earlobe to measure the oxygen saturation level in the blood
Erythrocyte -ANSWER✔✔Carry oxygen from lungs and deliver it to the body
Protodonata -ANSWER✔✔largest insects that ever lived
Pre-eclampsia -ANSWER✔✔Serious blood pressure conditions that develops
during pregnancy
Haplotype -ANSWER✔✔Set of DNA variants along a single chromosome that
tend to be inherited together because they are close to each other on the
chromosome
Species demarcation -ANSWER✔✔Not having successful progeny
Heterotherms -ANSWER✔✔Body temperature varies depending on the
environment
