21.3A Vocabulary

What is the primary function of the nervous system?

• To store minerals and support movement
• To produce hormones and regulate metabolism
• To collect and process information about the environment
• To protect internal organs and assist in blood cell formation

Which type of muscle tissue is characterized by involuntary, non-striated fibers?

• Cardiac muscle
• Smooth muscle
• Skeletal muscle
• Striated muscle

What is the main component of the integumentary system?

• Bones
• Muscles
• Skin
• Nerves

How do hormones travel throughout the body?

• Through nerve fibers
• Through blood vessels
• Through muscle tissue
• Through lymphatic vessels

What distinguishes motor neurons from other nerve cells?

• They only receive sensory information
• They send commands from muscles to the brain
• They send commands from the brain to muscles
• They only process information within the brain

What is the primary function of sensory neurons?

• To respond to environmental stimuli
• To control muscle movement
• To regulate hormone production
• To store minerals

Where is cardiac muscle primarily found?

• In blood vessels
• In skeletal joints
• In the middle layer of the heart
• In the digestive system

What defines minerals in terms of nutrition?

• Organic compounds essential for growth
• Inorganic elements essential for nutrition
• Proteins necessary for muscle development
• Vitamins required for metabolism

What characterizes striated muscle tissue?

• Smooth appearance under microscope
• Single nucleus per cell
• Alternating light and dark stripes
• Involuntary control

What type of radiation is ultraviolet?

• Ionizing radiation
• Non-ionizing radiation
• Infrared radiation
• Gamma radiation