Unlike skeletal muscle, cardiac and smooth muscle do not respond at all to the nervous system, but contract on their own. Differences in the rate of contraction of smooth and cardiac muscle are due to the action of pacemakers in cardiac muscles
Indicate whether the statement is true or false
FALSE
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You are studying meiosis in an organism where 2n=24. How many chromosomes will each nucleus have after meiosis II is complete?
A. 24 B. 12 C. 6 D. 48 Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about meiosis? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Arrange the three lines of defense from the first to the last
1 = Adaptive immune system 2 = Physical barriers 3 = Innate immune system
a. 1, 2, 3 b. 2, 1, 3 c. 2, 3, 1 d. 3, 1, 2 e. 3, 2, 1
Which event will lead to primary succession? a. None of these choices
b. Fire burning through 100 square miles of coniferous forest. c. A volcanic eruption on a Hawaiian island. d. A farm field being abandoned. e. A river flooding its banks every spring.
In order for a muscle to contract, calcium ions released from the sarcoplasmic reticulum must bind to
A. myosin. B. ATP. C. tropomyosin. D. troponin. E. actin.