The thin filaments (actin) contain a polypeptide subunit G actin that bears active sites for myosin attachment
Indicate whether the statement is true or false
TRUE
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The squid served as an ideal model system to study neurophysiology because
A) Squids are invertebrates and invertebrates have a simpler nervous system than vertebrates. B) The large diameter of the squid's neurons enabled researchers to make recordings from inside of a nerve cell. C) Fast electrical communication is a unique feature of squids. D) Squids are active predators and therefore have many nerves that can be easily studied.
Which joint in the body has the most range of motion?
A. sternoclavicular B. acromioclavicular C. glenohumeral D. humeroulnar
The extraembryonic membrane that persists as part of the urinary bladder is (the)
A) allantois. B) yolk sac. C) chorion. D) amnion. E) None of the answers are correct.
The trachea and lungs are components of the
A) endocrine system. B) digestive system. C) respiratory system. D) urinary system. E) lymphoid system.