Peptic ulcers are primarily caused by colonization of the stomach by what bacteria?

What cells release renin in response to signals from macula densa cells?

Bilirubin, a component of bile that causes the yellow coloration of skin in jaundice, is produced from a breakdown of what cells?

Match the numbers to the proper feature of nephron.

To treat renal failure, a process called ____________ uses an external membrane that acts like the kidney to filter blood.

What portion of the small intestine is the primary site of nutrient absorption?

What muscle keeps acid from the stomach out of the esophagus?

What triggers our saliva production?

A block is pulled up a slope by a force Fp = 65 N (parallel to the slope) as shown in the figure below. The mass of the block is 8.0 kg.  The slope makes an angle of 20° with the horizontal ground. The coefficients of kinetic and static friction between the box and the slope are μk = 0.20 and μs = 0.30, respectively. What is the net work done by all forces acting on the block if it moves a distance of 0.40 m up the slope? 

A driver’s life was saved in an automobile accident because an airbag expanded in front of his/her head. If the car had not been equipped with an airbag, the windshield would have stopped the motion of the driver’s head in a much shorter time. Compared to the windshield, the airbag: