Cushing's syndrome causes weight gain, excessive sweating, and muscle weakness. It can result from either the production of abnormally high levels of cortisol by the body or overuse of glucocorticosteroid drugs. You are an endocrinologist working with a Cushing's syndrome patient. She is on hormonal birth control pills and takes an occasional ibuprofen.Results from lab tests reveal abnormally high endogenous hormone levels, and you suspect a possible tumor. What regions will you ask the MRI technician to focus on?
A. Hypothalamus and posterior pituitary
B. Adrenal cortex only
C. Anterior and posterior pituitary
D. Hypothalamus, anterior pituitary, and adrenal cortex
Answer: D
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When mosquitoes search for their next blood meal, their sensory receptors respond to CO2 levels. Which of the following types of receptor is functioning?
A. a mechanoreceptor B. a thermoreceptor C. a nociceptor D. a chemoreceptor
The bacterial species Gemmata obscuriglobus can withstand high levels of radiation because ____
a. it has a membrane around its DNA b. its DNA is extra stable c. it is protected from the radiation by chloroplasts d. its Golgi bodies decontaminate the cell e. its circular DNA is inherently stable
Patients with damage to lower motor neurons located in the spinal cord (i.e. spinal cord injury) would not present with which of the following?
a. Muscle weakness b. Decreased muscle tone c. Hyperactive reflexes d. Diminished, or absent reflexes
Specific cells of diploid sporophytes undergo meiosis to produce
A) haploid, single-celled spores. B) haploid, single-celled gametes. C) diploid, multicellular spores. D) a diploid, single-celled zygote. E) diploid, multicellular gametes.