EEOB 2520 Physiology — Ohio State University
— Exam 1 Questions with verified Correct
Answers and Rationales
Introduction
This document contains 64 physiology practice questions with
precise answers and rationales covering core Exam 1 topics for
EEOB 2520, including homeostasis, cellular physiology, nervous
and endocrine systems, cardiovascular and respiratory physiology,
renal function, digestion, immunity, metabolism, and muscle
physiology. It is designed as study and exam-review material, with
questions addressing concepts such as membrane transport, action
potentials, blood and oxygen transport, hormone regulation, acid-
base balance, immune responses, and major organ-system
functions.
Exam Questions and Answers
1: What is the primary function of the cell membrane?--- correct
precise answer ---
The primary function of the cell membrane is to protect the cell by
acting as a barrier, controlling the movement of substances in and
out of the cell.
,2: Describe the role of mitochondria in cellular respiration.---
correct precise answer ---
Mitochondria are the powerhouses of the cell, where cellular
respiration occurs to produce ATP, the energy currency of the cell,
through processes like the Krebs cycle and oxidative
phosphorylation.
3: What is homeostasis and why is it important?--- correct precise
answer ---
Homeostasis is the process by which living organisms maintain a
stable internal environment despite changes in external conditions.
It is crucial for the survival and function of cells and the organism
as a whole.
4: Explain the concept of negative feedback in physiological
systems.--- correct precise answer --- Negative feedback is a
regulatory mechanism in which a change in a physiological variable
triggers a response that counteracts the initial change, thus
maintaining homeostasis.
5: What role do enzymes play in metabolism?--- correct precise
answer ---
Enzymes act as catalysts that speed up chemical reactions in
metabolism, allowing cells to efficiently convert substrates into
products necessary for life.
, 6: How do neurons transmit signals?--- correct precise answer ---
Neurons transmit signals through electrical impulses called action
potentials, which travel along the axon and trigger the release of
neurotransmitters at synapses to communicate with other neurons
or effector cells.
7: What is the function of the sodium-potassium pump in cells?---
correct precise answer ---
The sodium-potassium pump maintains the electrochemical
gradient across the cell membrane by actively transporting sodium
ions out of and potassium ions into the cell, which is essential for
nerve impulse transmission and muscle contraction.
8: Define osmosis and its significance in physiology.--- correct
precise answer ---
Osmosis is the passive movement of water molecules across a
semipermeable membrane from an area of lower solute
concentration to an area of higher solute concentration. It is
significant for maintaining cell turgor and fluid balance in tissues.
9: What are the main components of blood and their functions?---
correct precise answer ---
Blood consists of red blood cells (carry oxygen), white blood cells
(immune defense), platelets (blood clotting), and plasma (transport
nutrients, hormones, and waste).
10: How does the structure of hemoglobin facilitate oxygen
transport?--- correct precise answer --- Hemoglobins quaternary
— Exam 1 Questions with verified Correct
Answers and Rationales
Introduction
This document contains 64 physiology practice questions with
precise answers and rationales covering core Exam 1 topics for
EEOB 2520, including homeostasis, cellular physiology, nervous
and endocrine systems, cardiovascular and respiratory physiology,
renal function, digestion, immunity, metabolism, and muscle
physiology. It is designed as study and exam-review material, with
questions addressing concepts such as membrane transport, action
potentials, blood and oxygen transport, hormone regulation, acid-
base balance, immune responses, and major organ-system
functions.
Exam Questions and Answers
1: What is the primary function of the cell membrane?--- correct
precise answer ---
The primary function of the cell membrane is to protect the cell by
acting as a barrier, controlling the movement of substances in and
out of the cell.
,2: Describe the role of mitochondria in cellular respiration.---
correct precise answer ---
Mitochondria are the powerhouses of the cell, where cellular
respiration occurs to produce ATP, the energy currency of the cell,
through processes like the Krebs cycle and oxidative
phosphorylation.
3: What is homeostasis and why is it important?--- correct precise
answer ---
Homeostasis is the process by which living organisms maintain a
stable internal environment despite changes in external conditions.
It is crucial for the survival and function of cells and the organism
as a whole.
4: Explain the concept of negative feedback in physiological
systems.--- correct precise answer --- Negative feedback is a
regulatory mechanism in which a change in a physiological variable
triggers a response that counteracts the initial change, thus
maintaining homeostasis.
5: What role do enzymes play in metabolism?--- correct precise
answer ---
Enzymes act as catalysts that speed up chemical reactions in
metabolism, allowing cells to efficiently convert substrates into
products necessary for life.
, 6: How do neurons transmit signals?--- correct precise answer ---
Neurons transmit signals through electrical impulses called action
potentials, which travel along the axon and trigger the release of
neurotransmitters at synapses to communicate with other neurons
or effector cells.
7: What is the function of the sodium-potassium pump in cells?---
correct precise answer ---
The sodium-potassium pump maintains the electrochemical
gradient across the cell membrane by actively transporting sodium
ions out of and potassium ions into the cell, which is essential for
nerve impulse transmission and muscle contraction.
8: Define osmosis and its significance in physiology.--- correct
precise answer ---
Osmosis is the passive movement of water molecules across a
semipermeable membrane from an area of lower solute
concentration to an area of higher solute concentration. It is
significant for maintaining cell turgor and fluid balance in tissues.
9: What are the main components of blood and their functions?---
correct precise answer ---
Blood consists of red blood cells (carry oxygen), white blood cells
(immune defense), platelets (blood clotting), and plasma (transport
nutrients, hormones, and waste).
10: How does the structure of hemoglobin facilitate oxygen
transport?--- correct precise answer --- Hemoglobins quaternary
