BIOD 152: Comprehensive Final Exam (High-Yield 1-250)
Exam Portage Learning Questions and Answers 2026
Practice Set
1. Saltatory conduction occurs in which type of axons?
A. Unmyelinated axons
B. Myelinated axons
C. Dendrites only
D. All neurons in the CNS
Answer: B
Rationale: In myelinated axons, the electrical impulse "jumps" from one Node of Ranvier
to the next, significantly increasing the speed of transmission.
2. Which part of the brain is the primary center for maintaining balance and
posture?
A. Cerebrum
B. Cerebellum
C. Medulla Oblongata
D. Hypothalamus
Answer: B
Rationale: The cerebellum coordinates voluntary muscle movements and processes
input from proprioceptors to maintain equilibrium.
3. During the "Absolute Refractory Period," a neuron:
A. Can fire if the stimulus is strong enough
B. Cannot fire another action potential regardless of stimulus strength
C. Is at its resting membrane potential
D. Is releasing GABA
Answer: B
Rationale: This period ensures that action potentials are separate events and travel in
only one direction toward the axon terminal.
4. Which cranial nerve is responsible for the "Gag Reflex" and taste on the
posterior 1/3 of the tongue?
A. CN VII (Facial)
B. CN IX (Glossopharyngeal)
,C. CN X (Vagus)
D. CN XII (Hypoglossal)
Answer: B
Rationale: The Glossopharyngeal nerve provides both sensory and motor functions to
the throat and posterior tongue.
5. "Steroid" hormones differ from "Non-steroid" hormones because they:
A. Use a second messenger like cAMP
B. Are water-soluble
C. Are lipid-soluble and can bind to intracellular receptors
D. Only affect the heart
Answer: C
Rationale: Because they are made from cholesterol, steroids can diffuse through the
plasma membrane to act directly on DNA.
6. Which hormone is the primary regulator of the "Basal Metabolic Rate" (BMR)?
A. Insulin
B. Thyroxine (T4)
C. Glucagon
D. Cortisol
Answer: B
Rationale: Thyroid hormones regulate the rate at which cells consume oxygen and
nutrients to produce energy.
7. "Diabetes Insipidus" is caused by a clinical deficiency in:
A. Insulin
B. Glucagon
C. Antidiuretic Hormone (ADH)
D. Aldosterone
Answer: C
Rationale: A lack of ADH prevents the kidneys from reabsorbing water, leading to
massive volumes of dilute urine.
8. Which valve prevents the backflow of blood from the Left Ventricle into the Left
Atrium?
A. Tricuspid valve
B. Bicuspid (Mitral) valve
C. Aortic semilunar valve
D. Pulmonary semilunar valve
Answer: B
,Rationale: The mitral valve closes during ventricular systole to ensure blood moves
forward into the aorta.
9. In an EKG, "Ventricular Depolarization" is represented by the:
A. P wave
B. QRS complex
C. T wave
D. U wave
Answer: B
Rationale: The QRS complex marks the electrical activation of the ventricles, which
leads to their contraction.
10. Which blood component is a "cell fragment" essential for the process of
Hemostasis?
A. Erythrocyte
B. Leukocyte
C. Platelet (Thrombocyte)
D. Albumin
Answer: C
Rationale: Platelets form the initial plug at an injury site and release chemicals to trigger
the clotting cascade.
11. The "Universal Recipient" blood type is:
A. O negative
B. AB positive
C. A positive
D. B negative
Answer: B
Rationale: AB+ individuals have A, B, and Rh antigens, meaning they lack antibodies
against these markers and can receive any blood type.
12. Which immunoglobulin (antibody) is the first to be produced during a primary
immune response?
A. IgG
B. IgA
C. IgM
D. IgE
Answer: C
Rationale: IgM is a large pentamer that is highly effective at agglutinating (clumping)
pathogens early in an infection.
, 13. "Natural Killer (NK) Cells" are unique because they kill:
A. Only bacteria
B. Virus-infected and cancerous "self" cells non-specifically
C. Only by producing antibodies
D. Pathogens in the stomach acid
Answer: B
Rationale: NK cells monitor MHC-I markers; if a cell is "stressed" or missing its ID, the
NK cell triggers apoptosis.
14. The "Thoracic Duct" empties lymph into the:
A. Right Subclavian Vein
B. Left Subclavian Vein
C. Superior Vena Cava
D. Aorta
Answer: B
Rationale: The thoracic duct drains about 75% of the body's lymph, including everything
from the left side and the lower body.
15. "Boyle’s Law" explains that as the volume of the thoracic cavity increases:
A. The pressure inside the lungs increases
B. The pressure inside the lungs decreases, drawing air in
C. The temperature of the air rises
D. The heart stops
Answer: B
Rationale: Inhalation occurs when the diaphragm contracts, increasing volume and
lowering pressure below atmospheric levels.
16. Most "Oxygen" is transported in the blood by:
A. Dissolving in plasma
B. Binding to the iron in Hemoglobin (Oxyhemoglobin)
C. Converting to bicarbonate
D. Binding to white blood cells
Answer: B
Rationale: Each hemoglobin molecule can carry four oxygen molecules on its heme
groups.
17. "Surfactant" is vital for lung function because it:
A. Kills bacteria
B. Increases surface tension
C. Reduces surface tension to prevent alveolar collapse
Exam Portage Learning Questions and Answers 2026
Practice Set
1. Saltatory conduction occurs in which type of axons?
A. Unmyelinated axons
B. Myelinated axons
C. Dendrites only
D. All neurons in the CNS
Answer: B
Rationale: In myelinated axons, the electrical impulse "jumps" from one Node of Ranvier
to the next, significantly increasing the speed of transmission.
2. Which part of the brain is the primary center for maintaining balance and
posture?
A. Cerebrum
B. Cerebellum
C. Medulla Oblongata
D. Hypothalamus
Answer: B
Rationale: The cerebellum coordinates voluntary muscle movements and processes
input from proprioceptors to maintain equilibrium.
3. During the "Absolute Refractory Period," a neuron:
A. Can fire if the stimulus is strong enough
B. Cannot fire another action potential regardless of stimulus strength
C. Is at its resting membrane potential
D. Is releasing GABA
Answer: B
Rationale: This period ensures that action potentials are separate events and travel in
only one direction toward the axon terminal.
4. Which cranial nerve is responsible for the "Gag Reflex" and taste on the
posterior 1/3 of the tongue?
A. CN VII (Facial)
B. CN IX (Glossopharyngeal)
,C. CN X (Vagus)
D. CN XII (Hypoglossal)
Answer: B
Rationale: The Glossopharyngeal nerve provides both sensory and motor functions to
the throat and posterior tongue.
5. "Steroid" hormones differ from "Non-steroid" hormones because they:
A. Use a second messenger like cAMP
B. Are water-soluble
C. Are lipid-soluble and can bind to intracellular receptors
D. Only affect the heart
Answer: C
Rationale: Because they are made from cholesterol, steroids can diffuse through the
plasma membrane to act directly on DNA.
6. Which hormone is the primary regulator of the "Basal Metabolic Rate" (BMR)?
A. Insulin
B. Thyroxine (T4)
C. Glucagon
D. Cortisol
Answer: B
Rationale: Thyroid hormones regulate the rate at which cells consume oxygen and
nutrients to produce energy.
7. "Diabetes Insipidus" is caused by a clinical deficiency in:
A. Insulin
B. Glucagon
C. Antidiuretic Hormone (ADH)
D. Aldosterone
Answer: C
Rationale: A lack of ADH prevents the kidneys from reabsorbing water, leading to
massive volumes of dilute urine.
8. Which valve prevents the backflow of blood from the Left Ventricle into the Left
Atrium?
A. Tricuspid valve
B. Bicuspid (Mitral) valve
C. Aortic semilunar valve
D. Pulmonary semilunar valve
Answer: B
,Rationale: The mitral valve closes during ventricular systole to ensure blood moves
forward into the aorta.
9. In an EKG, "Ventricular Depolarization" is represented by the:
A. P wave
B. QRS complex
C. T wave
D. U wave
Answer: B
Rationale: The QRS complex marks the electrical activation of the ventricles, which
leads to their contraction.
10. Which blood component is a "cell fragment" essential for the process of
Hemostasis?
A. Erythrocyte
B. Leukocyte
C. Platelet (Thrombocyte)
D. Albumin
Answer: C
Rationale: Platelets form the initial plug at an injury site and release chemicals to trigger
the clotting cascade.
11. The "Universal Recipient" blood type is:
A. O negative
B. AB positive
C. A positive
D. B negative
Answer: B
Rationale: AB+ individuals have A, B, and Rh antigens, meaning they lack antibodies
against these markers and can receive any blood type.
12. Which immunoglobulin (antibody) is the first to be produced during a primary
immune response?
A. IgG
B. IgA
C. IgM
D. IgE
Answer: C
Rationale: IgM is a large pentamer that is highly effective at agglutinating (clumping)
pathogens early in an infection.
, 13. "Natural Killer (NK) Cells" are unique because they kill:
A. Only bacteria
B. Virus-infected and cancerous "self" cells non-specifically
C. Only by producing antibodies
D. Pathogens in the stomach acid
Answer: B
Rationale: NK cells monitor MHC-I markers; if a cell is "stressed" or missing its ID, the
NK cell triggers apoptosis.
14. The "Thoracic Duct" empties lymph into the:
A. Right Subclavian Vein
B. Left Subclavian Vein
C. Superior Vena Cava
D. Aorta
Answer: B
Rationale: The thoracic duct drains about 75% of the body's lymph, including everything
from the left side and the lower body.
15. "Boyle’s Law" explains that as the volume of the thoracic cavity increases:
A. The pressure inside the lungs increases
B. The pressure inside the lungs decreases, drawing air in
C. The temperature of the air rises
D. The heart stops
Answer: B
Rationale: Inhalation occurs when the diaphragm contracts, increasing volume and
lowering pressure below atmospheric levels.
16. Most "Oxygen" is transported in the blood by:
A. Dissolving in plasma
B. Binding to the iron in Hemoglobin (Oxyhemoglobin)
C. Converting to bicarbonate
D. Binding to white blood cells
Answer: B
Rationale: Each hemoglobin molecule can carry four oxygen molecules on its heme
groups.
17. "Surfactant" is vital for lung function because it:
A. Kills bacteria
B. Increases surface tension
C. Reduces surface tension to prevent alveolar collapse
