The body has several ways to keep blood moving forward through the veins. Which of the following does NOT explain how this happens?
A. The pressure in the veins is lower than the pressure in the arteries (i.e. blood flows down its pressure gradient).
B. Valves in the veins prevent backflow.
C. The aid of respiratory pump (changes in pressure in thoracic cavity during inhalation and exhalation).
D. The pumping of the venous endothelial contraction nodules (which act like a series of miniature hearts).
E. The aid of contractions of skeletal muscles.
Ans: D. The pumping of the venous endothelial contraction nodules (which act like a series of miniature hearts).
You might also like to view...
Autorhythmic cells
A) have organized sarcomeres. B) contribute to the force of contraction. C) are also called pacemakers because they set the rate of the heartbeat. D) are the same size as myocardial contractile cells. E) None of the answers are correct.
What other organelle besides the nucleus contain DNA?
a) Golgi complex b) lysosome c) ribosomes d) mitochondrion e) centrosome
What is housed within the vertebral canal?
What will be an ideal response?
Answer the following statement(s) true (T) or false (F)
1. The cerebellum is the largest part of the brain. 2. The forebrain consists of the cerebrum and the diencephalon. 3. The Wernicke area recognizes spoken and written language. 4. The amygdala, hippocampus, and hypothalamus are involved in such feelings as love, anger, fear, pleasure, and pain. 5. The vision association area resides primarily in the temporal lobe.