Which of the following is not true of testosterone?
A. It is a major male sex hormone.
B. It is produced by the sustentacular cells in the seminiferous tubules.
C. It has a significant effect on sex drive.
D. It is responsible for the development of secondary sexual characteristics.
E. All of these are true of testosterone.
Answer: B
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Type I fibers lack:
A) mitochondria. B) speed. C) a blood supply. D) myoglobin.
Near the carotid sinus,
A) the common carotid divides into an internal and an external branch. B) the internal carotids fuse with the vertebral arteries. C) the external carotid forms the internal carotid. D) veins and arteries form anastomoses. E) the aorta gives rise to the common carotids.
What will happen to a person who has been stabbed in the chest if the thoracic wall is punctured but the lung is NOT penetrated?
a. the intrapulmonary pressure becomes subatmospheric b. the intrpleural pressure becomes subatmospheric c. the intra-alveolar pressure becomes subatmospheric d. the lungs will collapse
The energy to drive the myosin movement during skeletal muscle contraction is provided by ATP.
Answer the following statement true (T) or false (F)