Muscle that is composed of cylindrical cells that maintain posture is ____
a. skeletal only
b. smooth only
c. cardiac only
d. both skeletal and cardiac
e. both cardiac and smooth
ANSWER: a
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In a single sodium-potassium pump cycle, ATP is used with the result that
A. 3 sodium ions leave and 2 potassium ions enter. B. 2 sodium ion enters and 1 potassium ion leaves. C. 2 sodium ion leaves and 1 potassium ion enters. D. 3 sodium ions enter and 2 potassium ions leave. E. sodium and potassium ions enter and water leaves.
Which of the following systems is NOT directly involved with regulation and maintenance of the body's chemistry?
A. the digestive system B. the circulatory system C. the respiratory system D. the urinary system E. the reproductive system
A pathway for cell growth control is conserved between Drosophila and humans, indicating that the
pathway is _______.
a. also found in prokaryotes d. at least 3.8 billion years old b. also found in all animals e. at least 8 million years old c. at least 800 million years old
The epidermis is made up of epithelial cells which are held tightly together side by side to prevent pathogens from entering the body and to prevent unnecessary water loss. What type of junction holds epithelial cells together to achieve this function?
A) tight junction B) communicating junction C) gap junction D) anchoring junction