Bio and earth sceince

To transport oxygen, nutrients, hormones, and waste products throughout the body. This system is essential for maintaining homeostasis and supporting cellular functions.

• Right side pumps deoxygenated blood to the lungs • Left side pumps oxygenated blood through arteries to the body This dual action is crucial for oxygenating blood and delivering it to tissues.

• Arteries carry blood away from the heart • Veins carry blood to the heart • Capillaries connect both and allow gas and nutrient exchange Each type of blood vessel has a unique structure and function in the circulatory system.

To bring oxygen into the body and remove carbon dioxide. This system is vital for gas exchange and maintaining blood pH.

Tiny air sacs with thin walls surrounded by capillaries that allow gas exchange between air and blood. Their design maximizes surface area for efficient gas exchange.

Their large surface area and thin walls make oxygen and carbon dioxide exchange efficient. This efficiency is crucial for meeting the body’s oxygen demands.

To break down food into nutrients the body can absorb and use. This process is essential for providing energy and building blocks for growth.

• Mouth breaks food • Stomach digests it with acid • Small intestine absorbs nutrients • Large intestine absorbs water and forms waste Each stage plays a critical role in nutrient absorption and waste elimination.

They speed up the chemical breakdown of food into smaller molecules. Enzymes are essential for efficient digestion and nutrient absorption.

It detects and destroys pathogens using white blood cells and antibodies. This defense mechanism is crucial for maintaining health and preventing infections.

To receive, process, and respond to information from the body and environment. This system coordinates bodily functions and responses to stimuli.

• CNS = brain and spinal cord • PNS = nerves connecting the CNS to the rest of the body Together, they facilitate communication between the brain and the body.

To produce and release hormones that regulate body functions. Hormones play a key role in growth, metabolism, and homeostasis.

They act as chemical messengers controlling growth, metabolism, and reproduction. Hormonal balance is crucial for overall health.

• Supports the body • Protects organs • Helps movement • Produces blood cells • Stores minerals This system provides structure and support for the body.

To allow movement, maintain posture, and produce heat. Muscle contractions are essential for all physical activities.

• Skeletal (voluntary) • Smooth (involuntary) • Cardiac (heart) Each type has distinct functions and characteristics.

To remove waste and maintain water and salt balance. This system is vital for homeostasis and detoxification.

They filter blood, remove waste, and produce urine. Nephrons are the functional units of the kidneys.

They regulate water, salt, and pH balance in the body. This regulation is crucial for overall health and function.

The lungs oxygenate blood; the heart pumps it around while removing carbon dioxide. This collaboration is essential for efficient gas exchange.

Muscles attach to bones; contraction of muscles moves bones. This interaction enables movement and physical activity.

Heart and breathing rates increase to deliver more oxygen to muscles for energy. This response is crucial for meeting the increased energy demands of muscles.

• Early atmosphere had carbon dioxide, methane, and water vapor • Now it’s mostly nitrogen and oxygen This change has significant implications for life and climate on Earth.