Which body system(s) is (are) dedicated to maintaining stable internal conditions by detecting and responding to stimuli?
A) Nervous and endocrine B) Nervous
C) Nervous, endocrine, and integumentary D) Endocrine
A
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The liver is part of the urinary system.
Answer the following statement true (T) or false (F)
The number of sperm cells ejaculated at one time is about:
a. 100,000–200,000 b. 300 million–500 million c. 1 million–3 million d. 3 million–5 million
Synthesis of phospholipids is a function of the
A) ribosomes. B) Golgi apparatus. C) lysosomes. D) mitochondria. E) smooth endoplasmic reticulum.
Water flows through a selectively permeable membrane in a process called ________, but water molecules cross the membrane more easily through channels of transmembrane proteins called ________.
A. filtration; aquaporins B. osmosis; aquaporins C. osmosis; water pumps D. osmosis; uniport E. filtration; water pumps