The cardiovascular system consists of the heart, blood vessels, and skeletal muscles.
Answer the following statement true (T) or false (F)
False
Skeletal muscles are not considered part of the cardiovascular system.
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A vascular bundle
A. contains xylem and phloem. B. is not found in leaves. C. is usually scattered in the stem of a eudicot. D. is on the outer surface of a root. E. is very distinct in the apical meristem.
The differential survival rates associated with birth weights in Figure 19-5 illustrate:
a. balanced polymorphism.
b. genetic drift.
c. neutral variation.
d. stabilizing selection.
e. disruptive selection
Which of the following statements concerning homeostasis in body temperature is NOT true? The body reacts to
A. heat by constricting the blood vessels in the skin. B. heat by stimulating the sweat glands. C. cold by contracting skeletal muscles in shivering. D. cold by rerouting blood away from the skin. E. All of the statements are not true.
The interval stage before the onset of DNA replication is called the ____________________.
A. G1 stage B. G2 stage C. M stage D. S stage E. G3 stage