Homeostasis AQA GCSE

Question 1

What is homeostasis?

Answer 1

Homeostasis is the process by which living organisms maintain a stable internal environment despite external changes.

Question 2

True or False: Homeostasis only applies to temperature regulation.

Answer 2

False

Question 3

Fill in the blank: Homeostasis involves the regulation of __________, pH, and ion concentrations.

Answer 3

temperature

Question 4

What is the importance of homeostasis?

Answer 4

It is crucial for the proper functioning of cells and overall health of an organism.

Question 5

Which organ system is primarily responsible for thermoregulation?

Answer 5

The integumentary system.

Question 6

What is negative feedback?

Answer 6

Negative feedback is a control mechanism that counteracts a change in a physiological variable, helping to restore it to its set point.

Question 7

Give an example of a negative feedback mechanism.

Answer 7

The regulation of blood glucose levels.

Question 8

True or False: Positive feedback mechanisms help return a system to its set point.

Answer 8

False

Question 9

What role do receptors play in homeostasis?

Answer 9

Receptors detect changes in the environment and send signals to effectors to initiate a response.

Question 10

What are effectors in the context of homeostasis?

Answer 10

Effectors are organs or cells that act to bring about a change in response to signals from receptors.

Question 11

Name a hormone involved in the regulation of blood sugar.

Answer 11

Insulin.

Question 12

What is the set point for human body temperature?

Answer 12

Approximately 37 degrees Celsius (98.6 degrees Fahrenheit).

Question 13

Fill in the blank: The maintenance of water balance in the body is known as __________.

Answer 13

osmoregulation

Question 14

True or False: Homeostasis can be disrupted by external factors such as temperature and pH changes.

Answer 14

True

Question 15

What is thermoregulation?

Answer 15

Thermoregulation is the process of maintaining an optimal body temperature.

Question 16

Which part of the brain is responsible for thermoregulation?

Answer 16

The hypothalamus.

Question 17

What happens to the body during hyperthermia?

Answer 17

The body temperature rises above normal levels, which can lead to heat stroke.

Question 18

Fill in the blank: The process of sweating helps to __________ the body.

Answer 18

cool

Question 19

What is the role of the kidneys in homeostasis?

Answer 19

The kidneys regulate water balance, electrolyte levels, and waste removal.

Question 20

Name one way the body responds to hypothermia.

Answer 20

Shivering to generate heat.

Question 21

True or False: Homeostasis is a static process.

Answer 21

False

Question 22

What is the physiological response to a drop in blood glucose levels?

Answer 22

The pancreas releases glucagon to raise blood glucose levels.

Question 23

Fill in the blank: The __________ system is involved in the regulation of blood pH.

Answer 23

respiratory

Question 24

What role does the liver play in homeostasis?

Answer 24

The liver regulates blood glucose levels, detoxifies harmful substances, and produces bile.

Question 25

What is osmosis?

Answer 25

Osmosis is the movement of water across a semi-permeable membrane from a region of low solute concentration to a region of high solute concentration.

Question 26

True or False: Homeostasis is only relevant to multicellular organisms.

Answer 26

False

Question 27

What happens during the process of vasodilation?

Answer 27

Blood vessels widen to increase blood flow and release heat.

Question 28

Fill in the blank: The __________ feedback loop amplifies changes rather than reducing them.

Answer 28

positive

Question 29

What is the primary function of the endocrine system in homeostasis?

Answer 29

To release hormones that regulate various body functions.

Question 30

What does the term 'homeostatic imbalance' refer to?

Answer 30

A disruption in homeostasis that can lead to disease or dysfunction.

Question 31

Fill in the blank: The __________ reflex helps to maintain blood pressure.

Answer 31

baroreceptor

Question 32

What is the primary role of the hypothalamus in the endocrine system?

Answer 32

To regulate the release of hormones from the pituitary gland.

Question 33

True or False: Blood pressure is an example of a regulated variable in homeostasis.

Answer 33

True

Question 34

What is the function of antidiuretic hormone (ADH)?

Answer 34

To promote water reabsorption in the kidneys, reducing urine output.

Question 35

Fill in the blank: The __________ system helps control body temperature through perspiration.

Answer 35

integumentary

Question 36

What is the primary purpose of the feedback mechanisms in homeostasis?

Answer 36

To maintain equilibrium within the body.

Question 37

What physiological changes occur during fight or flight response?

Answer 37

Increased heart rate, dilated pupils, and heightened alertness.

Question 38

Fill in the blank: __________ is the process of maintaining stable blood oxygen levels.

Answer 38

Oxygen homeostasis

Question 39

What is the role of the pancreas in regulating blood glucose?

Answer 39

The pancreas produces insulin and glucagon to lower and raise blood glucose levels, respectively.

Question 40

True or False: All organisms have the same homeostatic mechanisms.

Answer 40

False

Question 41

What does the term 'set point' refer to in homeostasis?

Answer 41

The ideal value for a physiological variable that the body tries to maintain.

Question 42

Fill in the blank: The __________ system helps regulate body fluids and electrolytes.

Answer 42

renal

Question 43

How does the body respond to increased temperature?

Answer 43

By increasing sweating and dilating blood vessels.

Question 44

True or False: Homeostasis is a dynamic process that requires constant adjustment.

Answer 44

True

Question 45

What role do electrolytes play in homeostasis?

Answer 45

They help maintain fluid balance, nerve function, and muscle contractions.

Question 46

Fill in the blank: The __________ is responsible for regulating the body's internal clock.

Answer 46

suprachiasmatic nucleus

Question 47

What is the role of glucagon?

Answer 47

Glucagon raises blood glucose levels by promoting glycogen breakdown in the liver.

Question 48

True or False: Homeostasis can be affected by stress and environmental changes.

Answer 48

True

Question 49

What is the primary function of the hypothalamic-pituitary axis?

Answer 49

To regulate the endocrine system and maintain homeostasis.

Question 50

Fill in the blank: __________ is the process by which the kidneys filter blood to form urine.

Answer 50

Filtration

Question 51

What happens to the body during dehydration?

Answer 51

The body retains water by reducing urine output and increasing thirst.

Question 52

True or False: Homeostasis is only necessary for human health.

Answer 52

False

Question 53

What is the role of the respiratory system in homeostasis?

Answer 53

To regulate oxygen and carbon dioxide levels in the blood.

Question 54

Fill in the blank: __________ are specialized cells that respond to changes in the environment.

Answer 54

Receptors

Question 55

What is the significance of the body's pH range?

Answer 55

A narrow pH range is essential for enzyme function and metabolic processes.

Question 56

True or False: The body can tolerate large fluctuations in internal conditions.

Answer 56

False

Question 57

What is the primary goal of homeostatic regulation?

Answer 57

To maintain stability and optimal functioning of the organism.

Question 58

Fill in the blank: __________ is a state of equilibrium in the body's internal environment.

Answer 58

Homeostasis

Question 59

What is the role of feedback loops in biological systems?

Answer 59

To coordinate physiological processes and maintain homeostasis.

Question 60

True or False: Homeostasis is maintained by both neural and hormonal signals.

Answer 60

True

Question 61

What is the physiological response to high blood pressure?

Answer 61

Blood vessels dilate and heart rate decreases to lower blood pressure.

Question 62

Fill in the blank: The __________ reflex helps regulate heart rate.

Answer 62

baroreceptor

Question 63

What is the purpose of the hypothalamus in temperature regulation?

Answer 63

To detect changes in temperature and initiate appropriate responses.

Question 64

True or False: Homeostasis is a passive process.

Answer 64

False

Question 65

What is the role of the autonomic nervous system in homeostasis?

Answer 65

To control involuntary bodily functions and responses.

Question 66

Fill in the blank: __________ feedback mechanisms are essential for childbirth.

Answer 66

Positive

Question 67

What is the importance of maintaining blood calcium levels?

Answer 67

Calcium is crucial for bone health, muscle function, and nerve signaling.

Question 68

True or False: The body can function optimally outside of its homeostatic range.

Answer 68

False

Question 69

What role does the adrenal gland play in stress response?

Answer 69

It releases hormones like adrenaline and cortisol to prepare the body for stress.

Question 70

Fill in the blank: __________ homeostasis is crucial for the function of the nervous system.

Answer 70

Ion

Question 71

What is the significance of the body's temperature range?

Answer 71

It is essential for enzyme activity and overall metabolic processes.

Question 72

True or False: The body can maintain homeostasis indefinitely without energy.

Answer 72

False

Question 73

What is the function of the thyroid gland in homeostasis?

Answer 73

To regulate metabolism and energy homeostasis through hormone production.