Aldosterone secretion from the adrenal cortex is stimulated by a(n) ________ in blood Na+ or a(n) ________ in blood K+.
A. decrease; increase
B. increase; decrease
C. increase; increase
D. decrease; decrease
Answer: A
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When a baby suckles at its mother's breast the stimulus at the breast is sent to the mother's brain (a region called the hypothalamus)
The brain responds by releasing hormones to stimulate the production and the ejection of milk from the breast. This helps the newborn to receive nourishment and encourages more suckling. This example is best described as a ________. A) negative feedback B) necessary life function C) loss of homeostasis D) positive feedback
Which of the following is an example of the skeletal system's primary function of providing structural support?
A) Calcium salts are found in bone. B) Bones change the magnitude and direction of the forces generated by skeletal muscles. C) Red marrow fills the internal cavities of many bones. D) The skull encloses the brain. E) Individual bones provide a framework for the attachment of soft tissues and organs.
One of the first endocrine events is secretion by the developing chorion of__________, a peptide hormone that prolongs the life span of the corpus luteum
Fill in the blank(s) with correct word
Which of the following vitamins is NOT correctly matched with its major function?
A. Folic acid - helps to make hemoglobin in red blood cells B. Vitamin K - helps to form collagen C. Vitamin A - helps in night vision D. Vitamin D - helps absorb calcium from the small intestine