When calcium levels in the blood are low, the ________ produce _______ which stimulates the breakdown of bone, releasing calcium.
A. parathyroid glands; parathyroid hormone
B. parathyroid glands; calcitonin
C. adrenal glands; calcitonin
D. adrenal glands; aldosterone
Answer: A. parathyroid glands; parathyroid hormone
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Besides controlling metabolic rate, thyroid hormone has many functions. These include ________
A) stimulating production of sex cells (egg an sperm) and secondary sex characteristics B) regulation of growth and development, and maturation of the nervous system C) regulation of blood calcium, and release of calcium from bones D) enabling the body to resist both short-term and long-term stressors
Lymph nodes contain two distinct regions: the inner ________ and the outer ________
A) medulla; cortex B) capsule; cortex C) cortex; medulla D) cortex; germinal center
What type of receptor detects tissue injury?
A. Thermoreceptors B. Photoreceptors C. Nociceptors D. Mechanoreceptors
Visual sensations from images focused on the side of the retina are blurred because
A. there are more cones than rods in this region. B. there are no rods in this region. C. the optic disc is located on the side of the retina. D. there are more rods than cones in this region.