Growing
Puberty
Outer layer of skin
Epidermis
Soft tissue within the dentin that contains nerves and blood vessels
Pulp
Muscles that cover the abdomen; help balance and posture
Abdominal muscles
Group of muscles in the back of the upper leg; bend the knee
Hamstrings
Body's ability to function at its best during daily physical activities without tiring easily
Physical fitness
Place where two or more bones join
Joint
Framework of bones that support and protect the body
Skeletal system
Transitional time of growth and development between childhood and adulthood
Adolescence
Inner layer of skin beneath the epidermis
Dermis
Protective outer covering of a tooth's crown; hardest substance in the body
Enamel
Body system that provides movement
Muscular system
Upper-arm muscle that straightens the arm
Triceps
The steady contraction of muscles against each other
Soft tissue in the open spaces of a bone
Bone marrow
Bone that is longer than it is wide and has enlarged ends
Long bone
Chemical messenger that regulates how the body works
Hormone
Layer of fat cells below the dermis; deepest layer of the integumentary system
Hypodermis
Film of harmful bacteria that forms on teeth
Plaque
Muscles that work automatically without your thinking about them
Involuntary muscles
Upper-arm muscle that bends the arm
Biceps
Exercise that causes muscles to use more oxygen; endurance exercise
Aerobic exercise
Small tube in the dermis that makes hair
Hair follicle
Strong, elastic band of fibrous tissue that connects bones and stabilizes joints
Ligament
Cleanliness habits that prevent disease and promote health
Hygiene
Skin condition in which clogged pores cause blemishes, or pimples
Acne
Hard, bone-like tissue that gives a tooth its shape
Dentin
Voluntary muscles
Muscle that forms the curve of the shoulder and lifts the arm
Deltoid
Exercise in which muscles do not use more oxygen; requires strength, speed, and agility rather than endurance
Anaerobic exercise
Group of muscles in the front of the upper leg; straighten the knee
Quadriceps
Lightweight, porous tissue that reduces a bone's weight
Body system that covers and protects the body; includes the skin, hair, and nails
Integumentary system
Oily substance produced by the sebaceous glands
Sebum
Disease caused by bacteria inside the mouth; also called cavities
Dental caries
Cord of white fibers that connects muscle to bone
Tendon
Back muscle that moves the shoulder and turns the head
Trapezius
Waste product formed during strenuous exercise
Lactic acid
Division of the skeleton that includes the head, spine, and ribs
Axial skeleton
Division of the skeleton that includes the shoulders, hips, arms, and legs
Appendicular skeleton