The key chemical messenger responsible for increasing cardiac output when animals are exercising or under certain stresses is

A. epinephrine.
B. acetylcholine.
C. dopamine.
D. serotonin.
E. glutamate.


A. epinephrine.

Biology & Microbiology

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Lianas and epiphytes are especially common in the:a

tropical rain forest. b. savanna. c. temperate grassland. d. chaparral. e. taiga.

Biology & Microbiology

Which organism caused the disease that destroyed potato crops and led to the Irish potato famine in the mid-1800s?

A) Alveolates B) Water mold C) Excavates D) Trypanosoma E) Kinetoplastids

Biology & Microbiology

Which statement is true regarding the size of an organism's genome and its complexity?

A) The larger the genome size, the more complex the organism. B) The smaller the genome size, the more complex the organism. C) Any organism with a genome size larger than that of an amoeba is considered "complex." D) Any organism with a genome size larger than that of a fruit fly is considered "complex." E) No apparent relationship exists between the size of an organism's genome and its complexity

Biology & Microbiology

The presence of ________ can be used to distinguish Staphylococcus from other Gram-positive cocci.

A. enterotoxins B. catalase enzyme C. protein M D. kinases E. hemolysins

Biology & Microbiology