Blood is moved through the vascular system by
a. valves in the wall of the blood vessels.
b. peristalsis caused by smooth muscle in the blood vessel walls.
c. pressure gradients created by the heart.
d. osmotic pressure.
e viscosity of the blood

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

What will happen if two of the base pairs of the stand of the dna are switched

Mr. j, age 42, is a construction worker in las vegas. he recently noticed that a mole on his face seemed to be getting larger and darker. at first he did not worry because he was in the sun a lot and assumed the change may have been caused by sunburn. after a month, not only was the mole larger and darker, but it appeared to be “bumpy.” his doctor diagnosed a malignant melanoma skin cancer following biopsy of the nevus. mr. j reports pain in his right shin that does not go away when he puts his feet up or sleeps. discussion questions 1. relate mr. j’s skin changes to the warning signs for malignant melanoma. (see malignant melanoma.) 2. discuss the normal progression of this malignancy. what is the significance of the bone pain that mr. j is experiencing? (see malignant melanoma.) 3. discuss the treatment available for this patient and the prognosis for recovery. (see malignant melanoma.)