Levels of Organization
What is the correct order of organization in living things, from smallest to largest?
Cell → Tissue → Organ → Organ System → Organism
The main job of the circulatory system
pumping blood
Which system provides support and protects organs?
Skeletal system
What is the control center of the body?
Brain
Which system produces hormones to control body functions?
Endocrine system
Groups of cells with the same structure and function form what?
Tissue
Tiny sacs in the lungs where gas exchange happens
alveoli
Which type of muscle is voluntary and moves bones?
Skeletal muscle
Which organ absorbs most nutrients from food?
Small intestine
What type of cells in the immune system help fight infections?
White blood cells
What is formed when tissues work together for a specific job?
Organ
Vessels that carry blood away from the heart
arteries
What connects muscle to bone?
Tendons
Which organ filters waste from the blood?
Kidneys
Which endocrine gland controls blood sugar by releasing insulin?
Pancreas
Which level of organization is the human heart, and why?
An organ, because it is made of different tissues that work together to pump blood.
The organ that pumps blood throughout the body
heart
What are the three types of muscle tissue, and which ones are voluntary or involuntary?
Skeletal (voluntary), Cardiac (involuntary), Smooth (involuntary)
What is the main role of the large intestine in digestion?
It absorbs water and forms solid waste.
How do the endocrine and circulatory systems work together?
Hormones made by glands travel through the blood to target organs.
Which tissue provides support, stores fat, and connects body parts?
Connective tissue
Explains how the circulatory and respiratory systems interact?
Oxygen is delivered to cells
Name two functions of the skeletal system other than movement.
Protects organs, produces blood cells, stores minerals like calcium.
Explain how the circulatory and excretory systems work together.
Circulatory system brings waste-filled blood to the kidneys, which filter and remove it.
When body temperature drops too low, how do different systems work together to restore homeostasis?
The nervous system detects the change, the muscular system causes shivering to produce heat, and the circulatory system reduces blood flow near the skin to conserve warmth.