Life Functions & Survival Needs Chapter 1: Human Biology
Maintain Boundaries Cells Surrounded by membrane that allows necessary materials in restricts damaging and unnecessary substances
Integumentary System Skin protects: Organs from drying out Bacteria from entering body From heat, sunlight and chemicals in environment
Movement Muscular system Pump blood Move food through body Move skeleton Remove waste
Responsiveness Sense changes (stimuli) in environment then react to them Nerves and Reflexes
Digestion Break down food Molecules absorbed into blood and transported to cells
Metabolism Cellular respiration Convert oxygen and nutrients into ATP(energy)
Excretion Remove wastes from body Digestive system produces feces Urinary system disposes of urine Skin produces sweat
Reproduction Reproductive system: Cell reproduction Produce offspring Mitosis: dividing one cell into two
Growth Increase in size Increase in number of cells
Homeostasis Body’s ability to maintain constant internal environment What are some examples of homeostasis in our body?
How we maintain homeostasis…
Negative Feedback Response by shutting off the original stimulus Examples: Increase in body temperature Blood pressure Breathing rate Heart rate Blood sugar
Positive Feedback Feedback that increases the stimulus Examples: Birth Blood clotting