40. Circulatory System

Label the parts of the human respiratory system. a. b. c. d. e. f. g.

Which of the following body systems facilitates (but doesn't regulate) the functions of the other systems? respiratory system endocrine system digestive system circulatory system

In which of the following organisms does oxygen diffuse directly across a respiratory surface to cells, without being carried by the blood? a. a grasshopper b. a whale c. an earthworm d. a mouse

What is the function of the cilia in the trachea and bronchi? a. to sweep air into and out of the lungs b. to increase the surface area for gas exchange c. to dislodge food that may have slipped past the epiglottis d. to sweep mucus with trapped particles up and out of the respiratory tract

What do the alveoli of mammalian lungs, the gill filaments of fish, and the tracheal tubes of insects have in common? a. use of a circulatory system to transport gases b. respiratory surfaces that are infoldings of the body wall c. countercurrent exchange d. a large, moist surface area for gas exchange

The diaphragm is a large sheet of muscle that helps move air in and out of your lungs. Breathing is automatically controlled by the brain, but you can choose to hold your breath or breathe deeper. What kind of muscle do you suppose makes up the diaphragm? (Explain your answer.)

Trace the path of an oxygen molecule in its journey from the air to a muscle cell in your arm, naming all the structures involved along the way.