Veins have a much lower blood pressure than arteries. Which of these prevents backflow of blood in veins?

A. pressure applied by the heart

B. one-way valves in veins

C. thin muscular walls of veins

A prevalence survey conducted from January 1 through December 31, 2012, identified 1,000 cases of schizophrenia in a city of 2 million persons. The incidence rate of schizophrenia in this population is 5/100,000 persons each year.

Plants are defined by what main characteristics?

Which sequence best describes the passage of sperm? 1. Seminiferous tubules. 2. Vas deference. 3. Epididymis 4. Ejaculatory duct 5. Urethra. A. 3,1,2,4,5 B. 1,3,2,4,5 C. 5,4.2,3,1 D. 1,3,4,2,5 E. 3,1,4,2,5

Which of the following statements is true for a eukaryotic cell? Select one of the options below as your answer: A. Does not possess intracellular membrane bound organelles. Everything inside just floats freely in the cytoplasm. B.

Which turn describes an organism that has a dentical allies for a treat

How many chromosomes does a child get from each parent?

The common house mouse species, Mus musculus, has the following taxonomic classification: Mus, Muridae, Rodentia, Mammalia, Chordata, Animalia, Eukarya. Which part of the name is the Family? A) Rodentia B) Chordata C) Muridae D) Animalia

What structural difference accounts for the functional differences between starch and cellulose? A) Starch can be digested by animal enzymes, whereas cellulose cannot.

A family brings their elderly father to emergency department. He has been exposed to pneumococcal pneumonia at his retirement home. Today, they noted a change in his mental status. They thought he might need some oxygen.

If a human cell contains 22 chromosomes and an y chromosome, it is called: