Myosin is
a. spherical.
b. the main structural component of the thick filaments.
c. is referred to as a regulatory protein.
d. all of these answers.
e. none of these answers.
B
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Answer the following statements true (T) or false (F)
1. Proper control of the hydrogen ion concentration is important to the functioning of hemoglobin. 2. The pH of a solution is based on the exponent of the hydrogen ion concentration. 3. More acids than bases are usually added to body fluids. 4. When sodium bicarbonate buffers a strong acid, the hydrogen ion from the acid replaces the carbon in the bicarbonate. 5. With successful CPR after a cardiac arrest, proper heart rate and breathing are restored. Because of this, the body’s respiratory and urinary pH control mechanisms can quickly return the body to its proper pH.
At the end of inspiration and at the end of expiration, intrapleural pressure is always equal to atmospheric pressure
Indicate whether the statement is true or false
We can localize sensations that originate in different areas of the body because
A) sensory neurons carry only one modality. B) sensory neurons from specific body regions project to specific cortical regions. C) incoming sensory information is first processed by the thalamus. D) different types of sensory receptors produce action potentials of different sizes and shapes. E) of the many types of tactile receptors.
When blood pressure is normal, the receptors in arterial walls fire action potentials
A) very seldom. B) continuously.