Renin secretion increases when blood pressure
A. decreases.
B. increases.
Answer: A
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Which of the following muscles attaches to the intertubercular sulcus of the humerus?
A. Deltoid B. Serratus anterior C. Pectoralis major D. Pectoralis minor E. Coracobrachialis
Which of the following features of the alveolar sacs allows for the ease of diffusion of gasses?
A) Type II alveolar cells secrete surfactant. B) They are made of a single layer of simple squamous epithelium. C) They are made of a single layer of simple squamous epithelium and elastin fibers allow the alveoli to stretch thin enough for diffusion to occur. D) Elastin fibers allow the alveoli to stretch thin enough for diffusion to occur.
Which endocrine organ is found superior to the thymus?
A. Pancreas B. Ovaries C. Adrenal gland D. Thyroid gland E. Testes
The _________ is the best-protected part of the CNS and controls the functions of the cardiac and respiratory systems.
A. brain stem B. cerebellum C. spinal cord D. cerebral cortex