Adipose tissue contains more water than lean muscle mass

During spontaneous breathing, the fall in intrapleural pressure that draws air into the lungs during inspiration also draws blood into the major thoracic vessels. This phenomenon increases which of the following?

a. Systemic vascular resistance b. Right ventricular afterload c. Right ventricular preload d. Pulmonary capillary resistance

Consider the following proportional relationship: x = ay/bd. Assuming all other quantities remain constant, what happens to the value of x when the product of bd increases?

a. increases b. decreases c. remains the same d. cannot be determined