Which of the following is part of the upper respiratory tract?

A) Lungs
B) Pharynx
C) Trachea
D) Bronchi
E) Bronchioles

An intercalated disc is an example location of ________.

A) hemidesmosome
B) an adhesion belt
C) a striation
D) gap junctions
E) goblet cells

Which type of gland is found in the middle ear?

A) mucus
B) ceruminous
C) sebaceous
D) mammary

When the National Mediation Board offers arbitration to negotiators covered by the Railway Labor Act, they are obligated to accept.

Bilateral symmetry is characteristic of ____.

A) cnidarians
B) sponges
C) jellyfish
D) flatworms
E) coral polyps

Drugs called calcium channel blockers may be used to lower blood pressure by causing arteries to vasodilate. How do you suppose these drugs work?

A) They prevent calcium from entering the sarcoplasmic reticulum of smooth muscle.
B) They stimulate the calcium pump in smooth muscle, thus removing calcium from the calmodulin.
C) They prevent calcium from exiting the sarcoplasmic reticulum in skeletal muscle.
D) They prevent calcium from entering cardiac muscle, thus slowing down the heart rate.
E) They prevent calcium from entering smooth muscle, thus allowing the muscle to relax.