When blood returns from the pulmonary circuit, it first enters which chamber of the heart?
a. left atrium
b. left ventricle
c. right atrium
d. right ventricle
e. both the left atrium and the right atrium
A
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Most moss gametophytes do not have a cuticle and are 1-2 cells thick. What does this imply about moss gametophytes and their structure?
A) They use stomata for gas exchange regulation. B) They can easily lose water to, and absorb water from, the atmosphere. C) Photosynthesis occurs throughout the entire gametophyte surface. D) They have branching veins in their leaves.
In salamander reproduction, another name for the fertilized egg is the __________
a. zygote b. gamete c. blastula d. gastrula
In your Ph.D. research, you use thin slices of brain tissue to study neuronal signaling. You attach an electrode to a single neuron, but cannot detect any activity. What is the most likely explanation?
A. Neurons are not electrically active; you should be recording neuroglia instead. B. Excessive myelination is blocking inputs to the cell. C. When you sliced the brain, you disconnected the cell from its dendrites. D. When you sliced the brain, you disconnected the cell from its neuroglia.
Which of the following is a mismatched pair:
1. local infection - restricted to small area 2. viremia - viruses traveling in the blood 3. secondary infection - symptoms reoccur occasionally for years after an initial infection (ex. genital herpes) 4. acute infection: rapid onset of symptoms 5. focal infection: original location of spreading infection