Predict where autonomic neurons act to regulate heart rate?
a. ventricular contractile cells
b. atrial contractile cells
c. autorhythmic SA node cells
d. Purkinje fibers
Answer: c. autorhythmic SA node cells
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This figure shows the muscles of facial expression. What muscle does number 3 indicate?
A. Nasalis B. Orbicularis oris C. Epicranius D. Orbicularis oculi E. Platysma
Which of the following surrounds the individual muscle cell?
A) perimysium B) endomysium C) epimysium D) fascicle
In the case of a person who consumes a normal, balanced diet, proteins are essential to the body for all of the following except ________.
A) production of energy B) production of some hormones C) production of enzymes, clotting factors, and antibodies D) formation of functional molecules like hemoglobin and cytochromes
Breathing air through the nose provides multiple functions. What function would be most impacted while breathing dry air?
A. Warming of the air B. Delivering the air to the lungs C. Providing a resonance chamber for speech D. Humidifying the air