Blood flow is affected by: (select all that apply)
a. blood viscosity.
b. blood vessel diameter.
c. blood pressure.
d. blood vessel length.
e. blood composition.
ANS: A, B, C, D
Resistance to flow is generally greater in longer tubes because resistance increases with length but decreases with a wider diameter. Blood flow varies inversely with the viscosity of the fluid. Thick fluids move more slowly and experience greater resistance to flow than thin fluids. In-creased blood pressure decreases blood flow because resistance is increased. Blood volume, not composition, plays a role in blood flow.
You might also like to view...
The nurse is completing a health history for a patient of the American Indian culture. What activity would the nurse perform while conducting this assessment?
A. Remembering what is being said to be recorded at a later date B. Encouraging free conversation by the American Indian patient C. Repeating back everything that is said D. Tape-recording the responses given
A Nurse Practitioner working in a dermatology clinic finds an open lesion on his patient. When assessing this lesion, what is an important assessment parameter?
When assessing this lesion, what is an important assessment parameter? A) Assess for wound edges, including overmining. B) Assess for size, including surrounding erythema. C) Assess for appropriate dressing. D) Assess for application of appropriate medication.
The student nurse studying bowel elimination learns that the following statements accurately describe the process of peristalsis. Select all that apply
A) The sympathetic nervous system stimulates movement. B) The autonomic nervous system innervates the muscles of the colon. C) Peristalsis occurs every 3 to 12 minutes. D) Mass peristaltic sweeps occur one to four times each 24-hour period in most people. E) Mass peristalsis often occurs after food has been ingested. F) One-third to one-half of ingested food waste is normally excreted in the stool within 48 hours.
The community health nurse visits the child-care center. Which finding indicates the need for staff education?
1. A group of 2 -year-olds are eating asnack of Cheerios. 2. Several 4-year-olds are outsideplaying on a slide. 3. An 18-month-old is pushing a toytruck. 4. A 2-month-old is sleeping in a crib onhis stomach.