APHY 101 Exam 1 Questions With Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. Which level of biological organization is composed of similar cells
performing a common function?
A. Organ
B. Organ system
C. Tissue
D. Organism
Rationale: Tissue is the correct answer because tissues consist of
groups of similar cells that work together to perform a specific
function. Examples include epithelial, connective, muscle, and nervous
tissue. Organs are made of multiple tissues, organ systems consist of
multiple organs, and an organism is the complete living individual.
2. Which organelle is primarily responsible for producing ATP within
a cell?
A. Ribosome
B. Nucleus
, C. Golgi apparatus
D. Mitochondrion
Rationale: Mitochondria are known as the "powerhouses" of the cell
because they generate ATP through cellular respiration. ATP serves as
the primary energy source for cellular activities. Ribosomes synthesize
proteins, the nucleus stores DNA, and the Golgi apparatus modifies
and packages proteins.
3. Which body cavity contains the lungs?
A. Abdominal cavity
B. Pelvic cavity
C. Thoracic cavity
D. Cranial cavity
Rationale: The thoracic cavity houses the lungs and heart. It is
separated from the abdominal cavity by the diaphragm. The cranial
cavity contains the brain, while the abdominal and pelvic cavities
contain digestive, urinary, and reproductive organs.
4. Homeostasis is best defined as:
A. Cell division
B. Growth and reproduction
C. Maintenance of a stable internal environment
D. Digestion of nutrients
,Rationale: Homeostasis refers to the body's ability to maintain
relatively constant internal conditions despite changes in the external
environment. Examples include regulating body temperature, blood
pressure, and blood glucose levels.
5. Which directional term means "toward the front of the body"?
A. Posterior
B. Inferior
C. Medial
D. Anterior
Rationale: Anterior refers to the front of the body. Posterior means
toward the back, superior means above, inferior means below, medial
means toward the midline, and lateral means away from the midline.
6. The basic structural and functional unit of life is the:
A. Tissue
B. Organ
C. Cell
D. Molecule
Rationale: The cell is the smallest unit capable of performing all life
processes. All tissues, organs, and organ systems are composed of
cells.
, 7. Which type of tissue is responsible for transmitting electrical
impulses?
A. Connective tissue
B. Muscle tissue
C. Epithelial tissue
D. Nervous tissue
Rationale: Nervous tissue specializes in communication by generating
and transmitting electrical signals throughout the body. Neurons are
the primary functional cells of nervous tissue.
8. Which organ system regulates hormone production?
A. Respiratory system
B. Digestive system
C. Endocrine system
D. Urinary system
Rationale: The endocrine system consists of glands that secrete
hormones into the bloodstream, regulating metabolism, growth,
reproduction, and homeostasis.
9. Which atom is most abundant in the human body by mass?
A. Carbon
B. Hydrogen
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. Which level of biological organization is composed of similar cells
performing a common function?
A. Organ
B. Organ system
C. Tissue
D. Organism
Rationale: Tissue is the correct answer because tissues consist of
groups of similar cells that work together to perform a specific
function. Examples include epithelial, connective, muscle, and nervous
tissue. Organs are made of multiple tissues, organ systems consist of
multiple organs, and an organism is the complete living individual.
2. Which organelle is primarily responsible for producing ATP within
a cell?
A. Ribosome
B. Nucleus
, C. Golgi apparatus
D. Mitochondrion
Rationale: Mitochondria are known as the "powerhouses" of the cell
because they generate ATP through cellular respiration. ATP serves as
the primary energy source for cellular activities. Ribosomes synthesize
proteins, the nucleus stores DNA, and the Golgi apparatus modifies
and packages proteins.
3. Which body cavity contains the lungs?
A. Abdominal cavity
B. Pelvic cavity
C. Thoracic cavity
D. Cranial cavity
Rationale: The thoracic cavity houses the lungs and heart. It is
separated from the abdominal cavity by the diaphragm. The cranial
cavity contains the brain, while the abdominal and pelvic cavities
contain digestive, urinary, and reproductive organs.
4. Homeostasis is best defined as:
A. Cell division
B. Growth and reproduction
C. Maintenance of a stable internal environment
D. Digestion of nutrients
,Rationale: Homeostasis refers to the body's ability to maintain
relatively constant internal conditions despite changes in the external
environment. Examples include regulating body temperature, blood
pressure, and blood glucose levels.
5. Which directional term means "toward the front of the body"?
A. Posterior
B. Inferior
C. Medial
D. Anterior
Rationale: Anterior refers to the front of the body. Posterior means
toward the back, superior means above, inferior means below, medial
means toward the midline, and lateral means away from the midline.
6. The basic structural and functional unit of life is the:
A. Tissue
B. Organ
C. Cell
D. Molecule
Rationale: The cell is the smallest unit capable of performing all life
processes. All tissues, organs, and organ systems are composed of
cells.
, 7. Which type of tissue is responsible for transmitting electrical
impulses?
A. Connective tissue
B. Muscle tissue
C. Epithelial tissue
D. Nervous tissue
Rationale: Nervous tissue specializes in communication by generating
and transmitting electrical signals throughout the body. Neurons are
the primary functional cells of nervous tissue.
8. Which organ system regulates hormone production?
A. Respiratory system
B. Digestive system
C. Endocrine system
D. Urinary system
Rationale: The endocrine system consists of glands that secrete
hormones into the bloodstream, regulating metabolism, growth,
reproduction, and homeostasis.
9. Which atom is most abundant in the human body by mass?
A. Carbon
B. Hydrogen
