John, who is training with margaret, has no heart monitor, and he cannot afford to buy one. he has to rely on his watch and his ability to measure his own pulse on his wrist. john is 27 years old and wants to train at the higher end of aerobic range, between 75% and 85% of his maximal heart rate. on his last run, john counted 30 heart beats in 15 seconds. is he training within his target range?

Mucous membranes.. a. cover or line external surface of body. b. line internal body surfaces that are in contact with the environment. c. produce antibodies to combat infection. d. secrete sweat, which has antibacterial enzymes.

Melanocytes and keratinocytes work together in protecting the skin from uv damage when keratinocytes a. provide the melanocyte with a protective shield against abrasion b. maintain the appropriate temperature so the product of the melanocyte will not denature c. maintain the appropriate ph in order for the melanocyte to synthesize melanin granules d. accumulate the melanin granules on their superficial portion, forming a uv-blocking pigment layer

What is also known as an attack in volleyball