Question 1

Imagine the following scenario:
Blood pressure decreases below normal levels.→ Blood flow to the heart decreases → Heart is unable to pump as much blood.→ Blood pressure decreases even more.
This is an example of ________ feedback.

Accepted Answer

This scenario describes a positive feedback loop because the initial decrease in blood pressure leads to a series of events that further decrease blood pressure, amplifying the original condition rather than correcting it.

Question 2

Which of the following is not a characteristic of homeostatic variables?

Accepted Answer

Homeostatic variables do not always remain at a fixed value; instead, they fluctuate within a narrow range to maintain a stable internal environment.

Question 3

-This is a sagittal section through the abdominopelvic cavity. What serous membrane does "B" represent?

Accepted Answer

The parietal peritoneum lines the abdominopelvic cavity, which is what is typically represented in a sagittal section through this area.

Question 4

-Directional terms are important in the study of anatomy. What does "E" represent?

Accepted Answer

The answer of 
-Directional terms are important in the study...

Question 5

-This is a sagittal section through the abdominopelvic cavity. What serous membrane does "C" represent?

Accepted Answer

The answer of 
-This is a sagittal section through the...

Question 6

This figure illustrates changes in blood pressure when ________ feedback mechanisms are in control.

Accepted Answer

The answer of This figure illustrates changes in blood pressure...

Question 7

-Directional terms are important in the study of anatomy. What does "B" represent?

Accepted Answer

The answer of 
-Directional terms are important in the study...

Question 8

Positive feedback mechanisms are more commonly seen in ________ individuals.

Accepted Answer

Positive feedback mechanisms are typically associated with unhealthy conditions because they tend to amplify a deviation from normal function, potentially leading to harmful or unstable conditions. For example, in the case of a fever, the body's temperature continues to rise without the usual negative feedback mechanisms that would restore balance. Healthy individuals rely more on negative feedback mechanisms to maintain homeostasis.

Question 9

Positive feedback mechanisms are less common in healthy individuals than negative feedback mechanisms.

Accepted Answer

Negative feedback mechanisms are more common in the body because they help maintain homeostasis by reversing changes to physiological parameters, whereas positive feedback mechanisms amplify changes and are less frequently used in maintaining normal function.

Question 10

-Directional terms are important in the study of anatomy. What does "C" represent?

Accepted Answer

The answer of 
-Directional terms are important in the study...

Question 11

-This is a sagittal section through the abdominopelvic cavity. What cavity does "D" represent?

Accepted Answer

The peritoneal cavity is the potential space between the parietal peritoneum and visceral peritoneum, and it is the cavity that would be represented in a sagittal section through the abdominopelvic cavity.

Question 12

-This is a sagittal section through the abdominopelvic cavity. What structures does "E" represent?

Accepted Answer

The answer of 
-This is a sagittal section through the...

Question 13

-Directional terms are important in the study of anatomy. What does "D" represent?

Accepted Answer

The answer of 
-Directional terms are important in the study...

Question 14

The control center compares input from a receptor with the ideal normal value for a condition called a set point.

Accepted Answer

The control center in a feedback system compares the input it receives from a receptor (which monitors changes in a controlled condition) with a set point, which is the ideal or normal value for that condition.

Question 15

Which branch of physiology would study the effects of sunbathing on the skin?

Accepted Answer

Organ physiology would study the effects of sunbathing on the skin, as it focuses on the function of specific organs, such as the skin, and how they respond to various stimuli.

Question 16

Imagine the following scenario:
Platelets adhere to a damaged blood vessel → Platelets secrete various substances → Platelets adhere to a damaged blood vessel
This is an example of ________ feedback.

Accepted Answer

This scenario describes a process where the initial action (platelets adhering to a damaged blood vessel) leads to an amplification of that action (more platelets adhering), which is characteristic of positive feedback mechanisms.

Question 17

The part of the feedback mechanism that processes information, relates it to other information, and makes a decision of action is the receptor.

Accepted Answer

The part of the feedback mechanism that processes information, relates it to other information, and makes a decision of action is the control center, not the receptor. The receptor's role is to detect changes in the environment (stimuli) and send information to the control center.

Question 18

In reference to the body temperature in living organisms, the set point can be defined as the

Accepted Answer

The set point in the context of body temperature in living organisms refers to the ideal normal value that the body aims to maintain, such as the average human body temperature of approximately 37°C (98.6°F). This concept is crucial in understanding how homeostasis works to keep internal conditions within a narrow, optimal range despite external changes.

Question 19

-This is a sagittal section through the abdominopelvic cavity. What structure does "A" represent?

Accepted Answer

The answer of 
-This is a sagittal section through the...

Question 20

Which of the following is not a function of the control center within a feedback mechanism?

Accepted Answer

The control center within a feedback mechanism is responsible for receiving and processing information, controlling effectors, and establishing a set point. It does not directly detect changes in the value of a variable; this is the role of the sensor or receptor.

Quiz 1: The Human Organism

Imagine the following scenario: Blood pressure decreases below normal levels.→ Blood flow to the heart decreases → Heart is unable to pump as much blood.→ Blood pressure decreases even more. This is an example of ________ feedback.

Which of the following is not a characteristic of homeostatic variables?

-This is a sagittal section through the abdominopelvic cavity. What serous membrane does "B" represent?

-Directional terms are important in the study of anatomy. What does "E" represent?

-This is a sagittal section through the abdominopelvic cavity. What serous membrane does "C" represent?

This figure illustrates changes in blood pressure when ________ feedback mechanisms are in control.

-Directional terms are important in the study of anatomy. What does "B" represent?

Positive feedback mechanisms are more commonly seen in ________ individuals.

Positive feedback mechanisms are less common in healthy individuals than negative feedback mechanisms.

-Directional terms are important in the study of anatomy. What does "C" represent?

-This is a sagittal section through the abdominopelvic cavity. What cavity does "D" represent?

-This is a sagittal section through the abdominopelvic cavity. What structures does "E" represent?

-Directional terms are important in the study of anatomy. What does "D" represent?

The control center compares input from a receptor with the ideal normal value for a condition called a set point.

Which branch of physiology would study the effects of sunbathing on the skin?

Imagine the following scenario: Platelets adhere to a damaged blood vessel → Platelets secrete various substances → Platelets adhere to a damaged blood vessel This is an example of ________ feedback.

The part of the feedback mechanism that processes information, relates it to other information, and makes a decision of action is the receptor.

In reference to the body temperature in living organisms, the set point can be defined as the

-This is a sagittal section through the abdominopelvic cavity. What structure does "A" represent?

Which of the following is not a function of the control center within a feedback mechanism?