BIO105 Anatomy and Physiology 1 Exam 1 Version
1 Questions with Correct Answers and Expert
Explanation for Each Question
1. Which directional term describes a structure that is farther from the point of
attachment or the trunk of the body?
A. Distal
B. Proximal
C. Medial
D. Superior
Correct Answer: A
Expert Explanation: Distal describes a position in a limb that is farther from the
point of attachment. This term is essential for describing the relationship between
different parts of the arms and legs. For instance, the fingers are distal to the palm
because they are further from the shoulder. Using standardized terminology
prevents confusion during medical procedures and diagnoses. In contrast, the term
proximal indicates a location closer to the point of origin or the trunk.
2. A plane that divides the body into superior (upper) and inferior (lower) portions is
known as a:
A. Transverse plane
B. Frontal plane
,C. Sagittal plane
D. Coronal plane
Correct Answer: A
Expert Explanation: The transverse plane, also called the horizontal plane, cuts the
body into top and bottom halves. This orientation is commonly used in CT scans and
MRI imaging to view cross-sections of organs. Understanding body planes is a
fundamental skill for interpreting anatomical illustrations and clinical imaging. It
allows health professionals to communicate the exact location of internal structures
clearly. Other planes like the sagittal or frontal divide the body into left/right or
front/back segments respectively.
3. What is the primary mechanism used by the body to maintain homeostasis by
reversing a change in a controlled condition?
A. Negative feedback
B. Positive feedback
C. Metabolic adaptation
D. Cellular differentiation
Correct Answer: A
,Expert Explanation: Negative feedback loops work to negate or reverse a stimulus
that has moved the body away from its set point. Most physiological systems,
including blood glucose and temperature regulation, rely on this specific
mechanism. When a change is detected, the body initiates a response to bring the
variable back to normal. This stability is vital for the survival of cells and the
organism as a whole. Without negative feedback, the body would be unable to
maintain internal equilibrium against external changes.
4. Which organelle is responsible for producing the majority of a cell’s ATP through
aerobic respiration?
A. Lysosome
B. Ribosome
C. Golgi apparatus
D. Mitochondria
Correct Answer: D
Expert Explanation: Mitochondria are often referred to as the powerhouses of the
cell because they generate chemical energy. They use oxygen and nutrients to
produce ATP, which fuels various cellular processes and reactions. The number of
mitochondria in a cell depends on that cell’s specific energy requirements. Muscle
cells, for example, contain high amounts of mitochondria to support physical
, movement and contraction. Failure of mitochondrial function can lead to significant
physiological disorders and decreased cellular efficiency.
5. The movement of water across a selectively permeable membrane from an area of
low solute concentration to high solute concentration is called:
A. Active transport
B. Facilitated diffusion
C. Osmosis
D. Endocytosis
Correct Answer: C
Expert Explanation: Osmosis is the specific term used for the passive movement of
water molecules across a membrane. It occurs naturally as water moves toward
higher concentrations of solutes to achieve balance. This process is critical for
maintaining fluid balance within and around the body’s cells. In clinical settings,
understanding osmosis helps in administering the correct IV fluid concentrations to
patients. If osmosis is not regulated, cells can either shrink or burst depending on
the environment.
6. Which level of organization consists of groups of similar cells working together to
perform a specific function?
A. Organ level
1 Questions with Correct Answers and Expert
Explanation for Each Question
1. Which directional term describes a structure that is farther from the point of
attachment or the trunk of the body?
A. Distal
B. Proximal
C. Medial
D. Superior
Correct Answer: A
Expert Explanation: Distal describes a position in a limb that is farther from the
point of attachment. This term is essential for describing the relationship between
different parts of the arms and legs. For instance, the fingers are distal to the palm
because they are further from the shoulder. Using standardized terminology
prevents confusion during medical procedures and diagnoses. In contrast, the term
proximal indicates a location closer to the point of origin or the trunk.
2. A plane that divides the body into superior (upper) and inferior (lower) portions is
known as a:
A. Transverse plane
B. Frontal plane
,C. Sagittal plane
D. Coronal plane
Correct Answer: A
Expert Explanation: The transverse plane, also called the horizontal plane, cuts the
body into top and bottom halves. This orientation is commonly used in CT scans and
MRI imaging to view cross-sections of organs. Understanding body planes is a
fundamental skill for interpreting anatomical illustrations and clinical imaging. It
allows health professionals to communicate the exact location of internal structures
clearly. Other planes like the sagittal or frontal divide the body into left/right or
front/back segments respectively.
3. What is the primary mechanism used by the body to maintain homeostasis by
reversing a change in a controlled condition?
A. Negative feedback
B. Positive feedback
C. Metabolic adaptation
D. Cellular differentiation
Correct Answer: A
,Expert Explanation: Negative feedback loops work to negate or reverse a stimulus
that has moved the body away from its set point. Most physiological systems,
including blood glucose and temperature regulation, rely on this specific
mechanism. When a change is detected, the body initiates a response to bring the
variable back to normal. This stability is vital for the survival of cells and the
organism as a whole. Without negative feedback, the body would be unable to
maintain internal equilibrium against external changes.
4. Which organelle is responsible for producing the majority of a cell’s ATP through
aerobic respiration?
A. Lysosome
B. Ribosome
C. Golgi apparatus
D. Mitochondria
Correct Answer: D
Expert Explanation: Mitochondria are often referred to as the powerhouses of the
cell because they generate chemical energy. They use oxygen and nutrients to
produce ATP, which fuels various cellular processes and reactions. The number of
mitochondria in a cell depends on that cell’s specific energy requirements. Muscle
cells, for example, contain high amounts of mitochondria to support physical
, movement and contraction. Failure of mitochondrial function can lead to significant
physiological disorders and decreased cellular efficiency.
5. The movement of water across a selectively permeable membrane from an area of
low solute concentration to high solute concentration is called:
A. Active transport
B. Facilitated diffusion
C. Osmosis
D. Endocytosis
Correct Answer: C
Expert Explanation: Osmosis is the specific term used for the passive movement of
water molecules across a membrane. It occurs naturally as water moves toward
higher concentrations of solutes to achieve balance. This process is critical for
maintaining fluid balance within and around the body’s cells. In clinical settings,
understanding osmosis helps in administering the correct IV fluid concentrations to
patients. If osmosis is not regulated, cells can either shrink or burst depending on
the environment.
6. Which level of organization consists of groups of similar cells working together to
perform a specific function?
A. Organ level
