Human Body Systems: Functions, Homeostasis, and Feedback

Posted on Apr 2, 2025 in Biology

1. Fill in the Blank Spaces

  1. What is the smallest unit of life in the human body? Cell
  2. Cells group together to form tissue.
  3. Tissues are grouped together to form various organs.
  4. Organs work together as part of a system.

2. Match the System with its Function

Human Body SystemFunction
Skeletal SystemSupport
Muscular SystemMovement
Respiratory SystemOxygen/Carbon Dioxide Exchange
Cardiovascular SystemTransport
Excretory SystemWaste Removal
Nervous SystemSends Chemical Messages
Lymphatic SystemReturns Fluids
Integumentary SystemProtection
Endocrine SystemControl
Reproductive SystemReproduction
Digestive SystemFood Absorption

3. Label the Parts of the Skin

  • Hair Follicle
  • Epidermis
  • Blood Vessels
  • Dermis
  • Sweat Glands

4. What is Homeostasis?

Homeostasis is the maintenance of a relatively stable internal environment.

5. Positive vs. Negative Feedback

Negative Feedback: A mechanism that occurs when body systems need to slow down or stop a process that is occurring.

Positive Feedback: A mechanism that occurs when body systems need to encourage or amplify a process.

6. Identify the Feedback Type

  1. When a person becomes too hot, they begin to sweat, which reduces the temperature of the body through evaporative cooling. Negative
  2. When a person becomes too cold, blood vessels constrict to conserve heat. A person shivers, which involuntarily contracts the muscles and generates heat. Negative
  3. After a meal, glucose levels are elevated, and the pancreas detects the change and produces insulin. Insulin and glucose move in the bloodstream around the body. Later, they will be stored/used for cellular work. Negative
  4. When glucose levels are low, the pancreas produces glucagon, which signals the release of stored glucose. Negative
  5. When the body sustains an injury, a message is sent to the brain. Proteins and platelets in the blood help clot or scab. Positive