Homeostasis Unit Review Worksheet
Homeostasis Unit Review
Interactive Diagram & Concept Study Packet
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Date:
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1. Levels of Organization
Directions: Match the definition to the correct level of organization.
CELL a. a group of cells with a similar function
TISSUE b. group of organs working together
ORGAN c. tissues working together for a function
ORGAN SYSTEM b. group of organs working together
Color & Study Anatomical Levels
[ 1 ]
[ 2 ]
[ 3 ]
[ 1 ] Cell (Green) | [ 2 ] Tissue (Yellow) | [ 3 ] Organ (Orange)
2. Nervous System
Electrical Control
Directions: Circle the correct answer options within each statement.
1. The Brain/Kidney/Pancreas and nerves are part of the nervous system.
2. The nervous system and the Endocrine/Respiratory/Digestive system are called the control systems of the body.
3. The specialized cells of the nervous system that transmit electrical signals are called Neurons/Nephrons/Alveoli.
4. A rapid, automatic response to a stimulus that does not involve conscious brain control is called a Reflex/Hormone/Peristalsis.
Color Anatomical Brain [ 1 ] [ 2 ] [ 3 ]
[ 1 ] Cerebrum (Yellow) | [ 2 ] Cerebellum (Blue) | [ 3 ] Spinal Cord (Green)
Brain Power Fun Fact!
Did you know? The human brain generates about 12 to 25 watts of electricity when awake—that is enough electrical power to light up a low-wattage LED lightbulb!
Unit: Human Homeostasis Page 1 of 4
Homeostasis Unit Review
Chemical Regulation & Heart/Lung Transport
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3. Endocrine System
Chemical Control
Directions: Circle the correct answer options within each statement.
1. The endocrine system is made up of Glands/Neurons/Alveoli that make chemical messengers called Hormones/Antibodies/Enzymes.
2. Insulin/Adrenaline/Thyroxine is a hormone that lowers blood sugar, produced in the Pancreas/Liver/Thyroid.
3. Adrenaline/Insulin/Estrogen is the fight-or-flight hormone.
4. Hormone levels are primarily controlled by Negative/Positive/Neutral feedback mechanisms.
5. The "master gland" that controls other endocrine glands is the Pituitary/Thyroid/Adrenal gland in the brain.
Color the Endocrine Glands [ 1 ] [ 2 ] [ 3 ]
[ 1 ] Thyroid (Orange) | [ 2 ] Adrenal (Yellow) | [ 3 ] Pancreas (Pink)
4. Circulatory System
Transport System
Directions: Circle the correct answer options within each statement.
1. The circulatory system's main purpose is to transport nutrients, oxygen, and metabolic wastes. The central organ pumping blood is the Heart/Brain/Lung.
2. Arteries carry blood Away/Back/Down from the heart, while veins carry it Back/Away/Up.
3. Oxygen is carried by Red/White/Platelet blood cells, while immune protection is run by White/Red/Plasma blood cells.
4. Tiny cell fragments called Platelets/Hormones/Neurons are responsible for blood clotting.
[ 1 ] [ 2 ] [ 3 ] [ 4 ]
[ 1 ] RA (Blue) | [ 2 ] LA (Red)
[ 3 ] RV (Light Blue) | [ 4 ] LV (Orange)
5. Respiratory System
Gas Exchange
Directions: Circle the correct answer options within each statement.
1. Gas exchange occurs in microscopic air sacs called Alveoli/Nephrons/Villi.
2. Oxygen/Carbon dioxide/Nitrogen moves into the blood, while Carbon dioxide/Oxygen/Hydrogen is released as waste.
3. The muscle contracting to draw air in is the Diaphragm/Heart/Bicep.
[ 1 ] [ 2 ] [ 3 ]
[ 1 ] Trachea (Yellow) | [ 2 ] Right Lung (Pink) | [ 3 ] Left Lung (Orange)
Unit: Human Homeostasis Page 2 of 4
Homeostasis Unit Review
Metabolism, Excretion & Immune Protection
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6. Digestive System
Nutrient Absorption
Directions: Circle the correct answer options within each statement.
1. Digestion begins in the mouth Mechanically/Chemically/Emotionally (teeth) and Chemically/Mechanically/Thermally (salivary enzymes).
2. The wave-like muscular contractions pushing food down the esophagus are called Peristalsis/Absorption/Digestion.
3. Nutrient absorption is optimized by microscopic folds called Villi/Nephrons/Alveoli in the small intestine.
4. The accessory organ producing fat-breaking bile is the Liver/Pancreas/Stomach.
[ 1 ] [ 2 ] [ 3 ] [ 4 ]
[ 1 ] Liver (Brown) | [ 2 ] Stomach (Pink) | [ 3 ] Colon (Yellow) | [ 4 ] Small Intestine (Orange)
7. Excretory System
Waste Removal
Directions: Circle the correct answer options within each statement.
1. The microscopic functional filtering components in the kidneys are called Nephrons/Neurons/Alveoli.
2. Soluble toxins, urea, and heat are eliminated on the skin's surface via Sweat/Pituitary/Adrenal glands.
3. Look at the picture to the right. The muscular tubes draining urine from the kidney down to the bladder are the Ureters/Alveoli/Bronchi.
[ 1 ] [ 2 ] [ 4 ] [ 3 ]
[ 1 ] Kidney (Brown) | [ 2 ] Medulla (Red)
[ 3 ] Bladder (Yellow) | [ 4 ] Ureters (Orange)
8. Immune System
Body Defense
Directions: Circle the correct answer options within each statement.
1. The immune system protects the body against disease-causing Pathogens/Hormones/Nutrients.
2. Barriers preventing pathogen entry include Skin/Nephrons/Neurons and chemical secretions like saliva or Mucus/Sweat/Insulin.
3. Y-shaped defense proteins tailored to attack foreign invaders are Antibodies/Antigens/Pathogens.
4. Active immunity can be boosted artificially via the injection of a Vaccine/Hormone/Antibiotic.
[ 1 ] [ 2 ] [ 3 ]
[ 1 ] WBC (Blue) | [ 2 ] Pathogen (Green) | [ 3 ] Antibody (Orange)
Unit: Human Homeostasis Page 3 of 4
Homeostasis Unit Review
Interactions, Disorders & Feedback Loops
Name:
9. Interactions Between Systems
Directions: Circle the correct answer options to describe homeostatic system interactions.
a. Nutrients/Wastes/Hormones from the digestive system are transported to cells by the Circulatory/Nervous/Immune system.
b. Waste from the respiratory system are removed by the Circulatory/Nervous/Endocrine system.
c. The Nervous/Immune/Digestive and Endocrine/Excretory/Circulatory systems work together to control the body.
d. The Immune/Circulatory/Digestive system protects the nervous system from disease.
e. The Digestive/Nervous/Respiratory system gives nutrients to the endocrine system.
10. Diseases & Disorders
Matching Challenge
1. AIDS
2. CANCER
3. DIABETES
4. ALLERGIES
5. STROKE
6. HEART ATTACK
7. COVID-19
8. FLU
9. MULTIPLE SCLEROSIS
10. ALZHEIMER'S
a. Failure to regulate blood sugar due to lack of insulin.
b. Caused by HIV; destroys white blood cell protection.
c. Neurodegenerative decline marked by memory loss and brain plaques.
d. Uncontrolled cell division resulting from genetic mutations.
e. Overreaction of the immune system to harmless environmental allergens.
f. Rupture or blockage of cerebral blood vessels depriving brain of oxygen.
g. Highly contagious respiratory infection caused by the influenza virus.
h. Coronary artery blockage depriving cardiac tissues of oxygen flow.
i. Highly infectious respiratory illness caused by the SARS-CoV-2 virus.
j. Autoimmune destruction of neuron myelin sheath protection.
11. Thermoregulation Negative Feedback Loop
Directions: Fill in the blanks below to complete the temperature homeostasis loops.
1
STIMULUS: Body temp rises. Receptors in the detect the change.
2
CONTROL CENTER: Signals are sent to the (region of brain).
3
EFFECTOR: Blood vessels in skin to lose heat, and glands secrete fluid.
Speedy Sneezes Fun Fact!
Did you know? A single human sneeze can travel at a speed of up to 100 miles per hour (160 km/h) and release about 40,000 microscopic droplets into the air!
Unit: Human Homeostasis Page 4 of 4
Internal Balance Slides
Biology Lecture Series Unit: Homeostasis
Internal Balance:
Homeostasis & Systems
An interactive exploration of how the human body organizes, regulates, and defends itself to maintain stable life.
Mr. Lenny's Science Class
Slide 1 of 8
Levels of Organization
Structural Hierarchy
01
Cell
The basic unit of life containing specialized organelles to carry out cellular metabolism.
02
Tissue
A collection of similar specialized cells grouped together to perform a single shared function.
03
Organ
A combination of multiple tissue types working side-by-side to accomplish a complex bodily process.
04
Organ System
A network of collaborative organs performing global physiological functions to support life.
From Atom to Organism Slide 2 of 8
Regulation & Control
How the Body Communicates
Nervous System
- Pathway: Electrochemical impulses across nerves
- Speed: Ultra-rapid (milliseconds)
- Key Organs: Brain, Spinal Cord, Peripheral Neurons
- Functions: Sensory input, rapid motor reflexes
Endocrine System
- Pathway: Chemical messengers (hormones) in blood
- Speed: Slow, long-lasting (minutes to years)
- Key Organs: Pituitary, Thyroid, Pancreas, Adrenals
- Functions: Growth, metabolism, blood sugar control
Coordinated Regulation Slide 3 of 8
Transport & Gas Exchange
Circulatory & Respiratory
The Circulatory System acts as the highway network of the body, pumping oxygenated blood and essential nutrients directly to cells while exporting waste products.
The Respiratory System constantly loads oxygen into red blood cells via thin alveoli and expels carbon dioxide.
Key Heart Chambers
Right Atrium
Receives deoxygenated blood
Left Atrium
Receives oxygen-rich blood
Right Ventricle
Pumps blood to lungs
Left Ventricle
Pumps blood to entire body
