Which of the following is most important to the heartbeat?

a. aortic valve

b. sinoatrial node

c. lymph node

d. tricuspid valve

Which function does a neuron perform in a human body?

when clown fish is ready to lay eggs it lays them near a sea anemone how this a reproductive strategy

How is the excretory system most likely to respond when an animal is thirsty? a) By relaxing the smooth muscles b) By retaining body fluids c) By absorbing heat from lymph glands d) By releasing hormones

Limb bones within unrelated animals that have the same basic structures are considered a. homologous structures. b. vestigial structures. c. embryological. End of exam d. analogous structures.

Yeast were exposed to various sugars in culture without oxygen According to the data in the culture with which sugar would the most ATP be measure maitose, because it is a disaccharide and has more high energy bonds glucose, because it is a

Which plant division has seeds with a 3n endosperm due to double fertilization?

What is a difference between systemic and pulmonary circulation? A. Systemic circulation carries deoxygenated blood to the lungs and pulmonary circulation carries oxygenated blood to the body. B.

Name the cells that are produced by the testes and ovaries

What description best explains why viruses can become more pathogenic to hosts that were not affected by the virus before?

The chief force pushing water and solutes out of the blood across the filtration membrane is A) the ionic electrochemical gradient B) protein-regulated diffusion C) glomerular hydrostatic pressure D) the size of the pores in the basement membrane of