"according to nasa, astronauts experience a 1% loss of bone per month in space. under microgravity conditions, osteoblast activity decreases and osteoclast activity increases ."

based on this information, which of the following explains the risks an astronaut might experience after a long mission in space?

a - bone stress would cause bone tissue to thicken
b- bone erosion would cause hormonal secretion's that decrease the absorption of calcium.
c- bone destroying cells would outnumber bone-building cells causing thinning
d- bone absorption would cause the matrix to lack calcium

Mr. wayne is a 38-year-old man with a significant history of elevated cholesterol levels. his father died at age 42 from a massive heart attack secondary to elevated cholesterol and triglycerides, and two of his older siblings are currently taking medications to lower their cholesterol levels. mr. wayne makes an appointment to discuss his risk for hypercholesterolemia. the nurse recognizes that mr. wayne is at risk for familial hypercholesterolemia because this is an autoomal dominant inherited condition. a. describe the pattern of autosomal dominant inheritance. b. mr. wayne asks what chance his children have of developing familial hypercholesterolemia. how should the nurse respond? c. explain the phenomenon of penetrance observed in autosomal dominant inheritance.