Q: What is another common term for single-unit smooth muscle? Read this paragraph and choose the correct option from the provided answers: Smooth muscle is organized in two ways: as single-unit smooth muscle, which is much more common; and as multiunit smooth muscle. The two types have different locations in the body and have different characteristics. Single-unit muscle has its muscle fibers joined by gap junctions so that the muscle contracts as a single unit. This type of smooth muscle is found in the walls of all visceral organs except the heart (which has cardiac muscle in its walls), and so it is commonly called visceral muscle. Because the muscle fibers are not constrained by the organization and stretchability limits of sarcomeres, visceral smooth muscle has a stress-relaxation response. This means that as the muscle of a hollow organ is stretched when it fills, the mechanical stress of the stretching will trigger contraction, but this is immediately followed by relaxation so that the organ does not empty its contents prematurely. This is important for hollow organs, such as the stomach or urinary bladder, which continuously expand as they fill. The smooth muscle around these organs also can maintain a muscle tone when the organ empties and shrinks, a feature that prevents "flabbiness" in the empty organ. In general, visceral smooth muscle produces slow, steady contractions that allow substances, such as food in the digestive tract, to move through the body. Multiunit smooth muscle cells rarely possess gap junctions, and thus are not electrically coupled. As a result, contraction does not spread from one cell to the next, but is instead confined to the cell that was originally stimulated. Stimuli for multiunit smooth muscles come from autonomic nerves or hormones but not from stretching. This type of tissue is found around large blood vessels, in the respiratory airways, and in the eyes. Choices: - abnormal muscle - lateral muscle - energies muscle - visceral muscle A:
visceral muscle

Q: What is another term for the early larval stage of a frog? Read this paragraph and choose the correct option from the provided answers: The majority of amphibian species go through a larval stage that is very different from the adult form, as you can see from the frog in Figure below . The early larval, or tadpole , stage resembles a fish. It lacks legs and has a long tail, which it uses to swim. The tadpole also has gills to absorb oxygen from water. As the larva undergoes metamorphosis , it grows legs, loses its tail, and develops lungs. These changes prepare it for life on land as an adult frog. Choices: - young - egg - ovary - tadpole A:
tadpole

Q: Q: How many types of major tissues do modern plants have? Read this paragraph and choose the correct option from the provided answers: A tissue is a group of specialized cells of the same kind that perform the same function. Modern plants have three major types of tissues. They're called dermal, ground, and vascular tissues. Choices: - two - seven - four - three A:
A: three

Question: Q: What type of plant tissue transports water and dissolved mineral upward to the leaves? Read this paragraph and choose the correct option from the provided answers: Xylem carries water and dissolved minerals from the roots upward to the leaves. Choices: - collagen - ectoderm - phloem - xylem A:
Answer: xylem

*Question*
Q: How metalloids behave in chemical interactions with other elements depends mainly on the number of what, in the outer energy level of their atoms? Read this paragraph and choose the correct option from the provided answers: How metalloids behave in chemical interactions with other elements depends mainly on the number of electrons in the outer energy level of their atoms. Metalloids have from three to six electrons in their outer energy level. Boron, pictured in the Figure below , is the only metalloid with just three electrons in its outer energy level. It tends to act like metals by giving up its electrons in chemical reactions. Metalloids with more than four electrons in their outer energy level (arsenic, antimony, and tellurium) tend to act like nonmetals by gaining electrons in chemical reactions. Those with exactly four electrons in their outer energy level (silicon and germanium) may act like either metals or nonmetals, depending on the other elements in the reaction. Choices: - protons - positrons - neutrons - electrons A:
**Answer**
electrons

Q: Nonvascular plants lack vascular tissue and what? Read this paragraph and choose the correct option from the provided answers: Nonvascular plants lack seeds and vascular tissue. Choices: - cytoplasm - chlorophyll - cells - seeds A:
seeds