When outdoor temperatures reached a ten-year high, the mountain hiker appeared flushed. Which action made her blood vessels get larger in diameter, allowing her to lose heat to the environment?
A. Vasomotor
B. Vasodilation
C. Vasoconstriction
D. Vasopressor
Answer: B
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Answer the following statements true (T) or false (F)
1. Dopamine and serotonin are neurotransmitters that can act as natural pain killers. 2. The brainstem consists of the medulla oblongata, the pons, and the midbrain. 3. Many of the “vital centers” are located in the brainstem. 4. The hypothalamus is important in regulation of body temperature. 5. The hypothalamus secretes ADH into the blood to help control water balance.
The organelles that provide 95% of the body's energy are ________.
A. ribosomes B. mitochondria C. adenosines D. cytoplasm
Select the characteristics of slow-twitch muscle fibers. Check all that apply.
A. Few capillaries are present. B. These fibers are also known as white fibers. C. Myoglobin is present in high concentration D. Mitochondria are numerous in these fibers.
Which of the following is a symptom of hyperthyroidism?
A. Organ enlargement B. Moon face C. Polydipsia D. Goiter