The “lub” heart sound is produced by closure of the ____________________ valves. Fill in the blank(s) with the appropriate word(s)


ANSWER: atrioventricular (AV)

Biology & Microbiology

You might also like to view...

You created a worm that expresses a human Bcl-2 transgene, and you are crossing the transgene into a homozygous ced-9 mutant background. However, you inadvertantly used a clone of Bcl-2 with a mutation in the BH domain, which is essential for function.  What results do you expect for the ced-9 mutants with the mutant Bcl-2 transgene?  

A.  131 cells will die. B.  All 1090 cells will die. C.  All 1090 cells will live. D.  959 cells will die. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean?   Gather Content · What do you already know about the apoptosis pathway?   Consider Possibilities · What other information is related to the question? Which information is most useful?   Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?   Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?

Biology & Microbiology

What do you know about electronegativity?

What will be an ideal response?

Biology & Microbiology

The breakdown of proteins in animals results in what type of waste product(s)?

What will be an ideal response?

Biology & Microbiology

Which of the following organelles breaks down worn-out organelles?

a. Golgi apparatus b. lysosomes c. smooth endoplasmic reticulum (ER) d. rough endoplasmic reticulum (ER) e. mitochondria

Biology & Microbiology