Structure and Support

the movement of substances across a cell membrane without the use of energy by the cell

• Active transport

• Passive transport

• Transport protein

• ATP

Natural spreading of particles through a liquid or gas of molecules from an area of higher concentration to an area of lower concentration

• Endocytosis

• Exocytosis

• Diffusion

• Transport protein

Movement of large substances out of the cell

• Diffusion

• Transport protein

• Endocytosis

• Exocytosis

small membrane sacs that specialize in moving products into, out of, and within a cell and found in large number per cell

• Vacuoles

• Vesicles

A tiny cell structure that carries out a specific function within the cell

• Organelle

• Tissues

• Organs

• Organ system

Front of upper arm

• Biceps

• Back of upper arm

To draw together, to reduce in size

• Contract

• Extend

Tough band of fibrous connective tissue that connects muscle to bone

• Tendon

• Joint

• Cartilage

• Ligament

What is the main function of white blood cells?

• To fight germs

• To absorb substances into cells

• To supply cells with energy

• To even out concentration gradients

When the arm flexes (bends upward), which muscle contracts?

• Biceps

• Triceps