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Chapter 1

QuestionAnswer
Chemical level Basic level; includes atoms, smallest components of a chemical element, and molecules.
Atoms essential for life Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Calcium, and Sulfur
Cellular level Molecules combine to form cells; Muscle cells, nerve cells, and blood cells
Cell Smallest living unit in the human body
Tissue level Epithelial, connective, muscle, nervous
Tissue Groups of cells and the materials surrounding them that work together to perform a particular function.
Organ level Different types of tissues join together to form body structures.
Organs Recognizable shape, different types of tissues, have specific functions.
System level Consists of related organs that have a common function. EX: Digestive system
Organism level Any living individual
Integumentary system Protects body; regulate body temperature; eliminates some wastes; helps make vitamin D; detects sensations such as touch, pain, warmth, and cold
Muscular system Participates in body movements, such as walking; maintains posture; produces heat
Skeletal system Supports and protects body; provides surface area for muscle attachments; aids body movements; houses cells that produce blood cells; stores minerals and lipids(fats)
Nervous system Generates action potentials to regulate body activities; detects changes in body's internal and external environment, interprets changes, and responds by causing muscular contractions or glandular secretions
Endocrine System regulates body activities by releasing horomones
Lymphatic system and immune Returns proteins and fluid to blood; carries lipids from gastrointestinal tract to blood; contains sites of maturation and proliferation of B cells and T cells that protect against disease-causing microbes.
Cardiovascular system Heart pumps blood through blood vessels; blood carries oxygen and nutrients to cells and carbon dioxide and wastes away from cells and helps regulate acid-base balance, temperature, and water content of body fluids;
Blood components help defend against disease and repair damaged blood vessels
Respiratory system Transfers oxygen from inhaled air to blood and carbon dioxide from blood to exhaled air; helps regulate acid-base balance of body fluids; air flowing out of lungs through vocal cords produces sounds
Digestive system Achieves physical and chemical breakdown of food; absorbs nutrients; eliminates solid waste
Reproductive system Release hormones that regulate reproduction
Created by: glosantelices