PHS3341 MIDTERM 1 — COMPLETE PRACTICE TEST BANK
Updated Actual Questions & Correct Answers | Verified Answers Plus Detailed Rationales |
2026 Q&A
Course: PHS3341 — Physiology of Sensation, Regulation, Movement and Reproduction
Exam: Midterm 1
Format: 500 Exam-Style Multiple-Choice Questions with Verified Answers & Detailed
Rationales
All Core Domains Covered | A+ Graded | Latest Update
TABLE OF CONTENTS
| Section | Core Domain | Questions |
|---------|-------------|-----------|
| 1 | Homeostasis & Homeostatic Control Systems | 1–50 |
| 2 | Body Fluid Compartments & Osmolarity | 51–100 |
| 3 | Cell Membrane Structure & Transport Mechanisms | 101–180 |
| 4 | Diffusion, Osmosis & Tonicity | 181–240 |
| 5 | Membrane Potential & Electrophysiology | 241–310 |
| 6 | Action Potentials & Graded Potentials | 311–380 |
| 7 | Synaptic Transmission & Neural Integration | 381–450 |
| 8 | Nervous System Organization & Neural Tissue | 451–500 |
EXAM OVERVIEW
Exam Name: PHS3341 Midterm 1 — Updated Actual Questions & Correct Answers
,Course: Physiology of Sensation, Regulation, Movement and Reproduction
Core Domains Covered:
- Homeostasis and homeostatic control systems (sensors, control centers, effectors, feedback
loops)
- Body fluid compartments (ICF, ECF, plasma, interstitial fluid)
- Cell membrane structure and transport mechanisms (passive, active, primary, secondary)
- Diffusion, osmosis, osmolarity, tonicity
- Membrane potential and electrophysiology (Nernst equation, Goldman-Hodgkin-Katz
equation, Na⁺/K⁺ ATPase)
- Action potentials, graded potentials, refractory periods
- Synaptic transmission (ionotropic and metabotropic receptors, neurotransmitters)
- Nervous system organization and neural tissue (CNS, PNS, glial cells, neuronal structure)
Key Topics Based on Course Learning Objectives:
- Homeostasis and dynamic constancy
- Components of homeostatic control systems
- Negative vs. positive feedback and feedforward regulation
- Diffusion and diffusion equilibrium
- Factors affecting net flux across membranes
- Ion channels vs. mechanically gated ion channels
- Primary vs. secondary active transport
- Osmolarity, penetrating vs. nonpenetrating solutes
- Endocytosis and its three classes (phagocytosis, pinocytosis, receptor-mediated
endocytosis)
- Basic components of the nervous system
- Membrane potential and resting membrane potential
- Nernst equation and Goldman-Hodgkin-Katz equation
,- Action potential generation and propagation
- Synaptic transmission and postsynaptic receptors
- Neural tissue: neurons and glial cells
Passing Standard: 75% (recommended for self-assessment)
SECTION 1: HOMEOSTASIS & HOMEOSTATIC CONTROL SYSTEMS (Questions 1–50)
Question 1
What is the definition of homeostasis?
A) Maintaining a constant internal environment regardless of external conditions
B) Maintaining relatively stable internal conditions despite external environment changes
C) Maintaining complete equilibrium with the external environment
D) Maintaining variable internal conditions to match external changes
Answer: B
Rationale: Homeostasis is the maintenance of relatively stable internal conditions even
though the external environment changes continuously. It does not mean a completely
constant state—levels may change in the short term but remain relatively constant over
longer periods (dynamic constancy).
---
Question 2
What does the term "dynamic constancy" refer to in the context of homeostasis?
, A) Internal conditions never change
B) Levels may change in the short term but remain relatively constant over longer periods
C) Internal conditions constantly fluctuate without any pattern
D) Internal conditions always match external conditions
Answer: B
Rationale: Dynamic constancy means that physiological variables may change in the short
term but remain relatively constant over longer periods. This concept acknowledges that
homeostasis is not a static process.
---
Question 3
Which of the following is a regulated (sensed) variable?
A) Heart rate
B) Blood hematocrit
C) Blood pressure
D) Testosterone levels
Answer: C
Rationale: Blood pressure is a regulated variable because it is maintained within a
predictable range by physiological mechanisms that operate continuously. A sensor exists
within the system that monitors blood pressure within a limited range.
---
Updated Actual Questions & Correct Answers | Verified Answers Plus Detailed Rationales |
2026 Q&A
Course: PHS3341 — Physiology of Sensation, Regulation, Movement and Reproduction
Exam: Midterm 1
Format: 500 Exam-Style Multiple-Choice Questions with Verified Answers & Detailed
Rationales
All Core Domains Covered | A+ Graded | Latest Update
TABLE OF CONTENTS
| Section | Core Domain | Questions |
|---------|-------------|-----------|
| 1 | Homeostasis & Homeostatic Control Systems | 1–50 |
| 2 | Body Fluid Compartments & Osmolarity | 51–100 |
| 3 | Cell Membrane Structure & Transport Mechanisms | 101–180 |
| 4 | Diffusion, Osmosis & Tonicity | 181–240 |
| 5 | Membrane Potential & Electrophysiology | 241–310 |
| 6 | Action Potentials & Graded Potentials | 311–380 |
| 7 | Synaptic Transmission & Neural Integration | 381–450 |
| 8 | Nervous System Organization & Neural Tissue | 451–500 |
EXAM OVERVIEW
Exam Name: PHS3341 Midterm 1 — Updated Actual Questions & Correct Answers
,Course: Physiology of Sensation, Regulation, Movement and Reproduction
Core Domains Covered:
- Homeostasis and homeostatic control systems (sensors, control centers, effectors, feedback
loops)
- Body fluid compartments (ICF, ECF, plasma, interstitial fluid)
- Cell membrane structure and transport mechanisms (passive, active, primary, secondary)
- Diffusion, osmosis, osmolarity, tonicity
- Membrane potential and electrophysiology (Nernst equation, Goldman-Hodgkin-Katz
equation, Na⁺/K⁺ ATPase)
- Action potentials, graded potentials, refractory periods
- Synaptic transmission (ionotropic and metabotropic receptors, neurotransmitters)
- Nervous system organization and neural tissue (CNS, PNS, glial cells, neuronal structure)
Key Topics Based on Course Learning Objectives:
- Homeostasis and dynamic constancy
- Components of homeostatic control systems
- Negative vs. positive feedback and feedforward regulation
- Diffusion and diffusion equilibrium
- Factors affecting net flux across membranes
- Ion channels vs. mechanically gated ion channels
- Primary vs. secondary active transport
- Osmolarity, penetrating vs. nonpenetrating solutes
- Endocytosis and its three classes (phagocytosis, pinocytosis, receptor-mediated
endocytosis)
- Basic components of the nervous system
- Membrane potential and resting membrane potential
- Nernst equation and Goldman-Hodgkin-Katz equation
,- Action potential generation and propagation
- Synaptic transmission and postsynaptic receptors
- Neural tissue: neurons and glial cells
Passing Standard: 75% (recommended for self-assessment)
SECTION 1: HOMEOSTASIS & HOMEOSTATIC CONTROL SYSTEMS (Questions 1–50)
Question 1
What is the definition of homeostasis?
A) Maintaining a constant internal environment regardless of external conditions
B) Maintaining relatively stable internal conditions despite external environment changes
C) Maintaining complete equilibrium with the external environment
D) Maintaining variable internal conditions to match external changes
Answer: B
Rationale: Homeostasis is the maintenance of relatively stable internal conditions even
though the external environment changes continuously. It does not mean a completely
constant state—levels may change in the short term but remain relatively constant over
longer periods (dynamic constancy).
---
Question 2
What does the term "dynamic constancy" refer to in the context of homeostasis?
, A) Internal conditions never change
B) Levels may change in the short term but remain relatively constant over longer periods
C) Internal conditions constantly fluctuate without any pattern
D) Internal conditions always match external conditions
Answer: B
Rationale: Dynamic constancy means that physiological variables may change in the short
term but remain relatively constant over longer periods. This concept acknowledges that
homeostasis is not a static process.
---
Question 3
Which of the following is a regulated (sensed) variable?
A) Heart rate
B) Blood hematocrit
C) Blood pressure
D) Testosterone levels
Answer: C
Rationale: Blood pressure is a regulated variable because it is maintained within a
predictable range by physiological mechanisms that operate continuously. A sensor exists
within the system that monitors blood pressure within a limited range.
---
