Question 1

Which of the following best describes homeostasis?

Accepted Answer

The state of internal conditions maintained by living things, where the body monitors its internal state and takes action to correct disruptions that threaten normal function.

Question 2

A patient is diagnosed with Type 1 diabetes mellitus. Which of the following best explains the underlying pathophysiology?

Accepted Answer

The immune system destroys pancreatic beta cells, resulting in little or no insulin production.

Question 3

Which of the following is an example of positive feedback in the human body?

Accepted Answer

Uterine contractions during childbirth, where oxytocin release intensifies contractions.

Question 4

What is the main function of negative feedback in physiological systems?

Accepted Answer

To stabilize the regulated variable and aid the system in maintaining homeostasis.

Question 5

Which of the following correctly matches the component of a negative feedback system with its function?

Accepted Answer

Control center: processes information and decides on the response.

Question 6

A person is exposed to cold temperatures. Which sequence best describes the negative feedback response to maintain body temperature?

Accepted Answer

Receptor (thermoreceptors) → Control center (hypothalamus) → Effector (muscles shiver) → Restoration of temperature

Question 7

Which of the following is NOT a function of the circulatory system?

Accepted Answer

Synthesis of hormones.

Question 8

Which statement about the structure of an atom is correct?

Accepted Answer

Protons and neutrons are found in the nucleus, while electrons orbit the nucleus in energy levels.

Question 9

Which of the following correctly matches each atomic particle with its charge?

Accepted Answer

Proton: positive, Neutron: neutral, Electron: negative

Question 10

Which type of bond is responsible for the formation of ions by transferring electrons between atoms?

Accepted Answer

Ionic bond

Question 11

A sodium atom ($$Na) $$loses one electron to become $$Na^+. $$What type of ion is $$Na^+$$ and what is its charge?

Accepted Answer

Cation, positive charge

Question 12

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a slightly positive hydrogen atom and a slightly negative atom (such as oxygen or nitrogen) in another molecule.

Question 13

Which of the following is a real-life example of a process that relies on hydrogen bonding?

Accepted Answer

Water molecules ($$H_2O) $$sticking together, contributing to surface tension.

Question 14

Which of the following best explains why polar covalent bonds are important in biological molecules?

Accepted Answer

They result in molecules with partial positive and negative charges, enabling interactions like hydrogen bonding.

Question 15

A patient is experiencing muscle weakness due to an electrolyte imbalance. Which ions are most directly involved in muscle contraction and blood clotting?

Accepted Answer

$$Ca^{2+}$$ and $$Na^+$$

Question 16

Which of the following is the correct sequence of events in a negative feedback loop regulating blood glucose?

Accepted Answer

Stimulus (high glucose) → Receptor (pancreas) → Control center (pancreas) → Effector (insulin release)

Question 17

Which of the following best describes the role of the effector in a negative feedback system?

Accepted Answer

It carries out the response directed by the control center to restore balance.

Question 18

Which of the following is an example of a pathological condition?

Accepted Answer

The body fails to maintain critical variables within normal limits, resulting in disease.

Question 19

Which of the following best describes the difference between a cation and an anion?

Accepted Answer

A cation is a positively charged ion, while an anion is negatively charged.

Question 20

Which of the following best explains why negative feedback is essential for homeostasis?

Accepted Answer

It stabilizes physiological variables by reversing changes and restoring balance.

Fundamental Concepts in Anatomy & Physiology: Homeostasis, Body Systems, and Atomic Structure

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