Q: Answer the following question given this paragraph: The muscles all begin the actual process of contracting (shortening) when a protein called actin is pulled by a protein called myosin. This occurs in striated muscle (skeletal and cardiac) after specific binding sites on the actin have been exposed in response to the interaction between calcium ions (Ca++) and proteins (troponin and tropomyosin) that "shield" the actinbinding sites. Ca++ also is required for the contraction of smooth muscle, although its role is different: here Ca++ activates enzymes, which in turn activate myosin heads. All muscles require adenosine triphosphate (ATP) to continue the process of contracting, and they all relax when the Ca++ is removed and the actin-binding sites are re-shielded. A muscle can return to its original length when relaxed due to a quality of muscle tissue called elasticity. It can recoil back to its original length due to elastic fibers. Muscle tissue also has the quality of extensibility; it can stretch or extend. Contractility allows muscle tissue to pull on its attachment points and shorten with force. Differences among the three muscle types include the microscopic organization of their contractile proteinsactin and myosin. The actin and myosin proteins are arranged very regularly in the cytoplasm of individual muscle cells (referred to as fibers) in both skeletal muscle and cardiac muscle, which creates a pattern, or stripes, called striations. The striations are visible with a light microscope under high magnification (see Figure 10.2). Skeletal muscle fibers are multinucleated structures that compose the skeletal muscle. Cardiac muscle fibers each have one to two nuclei and are physically and electrically connected to each other so that the entire heart contracts as one unit (called a syncytium). Because the actin and myosin are not arranged in such regular fashion in smooth muscle, the cytoplasm of a smooth muscle fiber (which has only a single nucleus) has a uniform, nonstriated appearance (resulting in the name smooth muscle). However, the less... Q: A muscle can return to its original length when relaxed due to a quality of muscle tissue called what? A:

OPTIONS:
- reach
- viscosity
- moisture
- elasticity

A: elasticity

input: OPTIONS:
- charged ions
- joined ions
- realized ions
- separated ions Now, answer this question: Answer the following question given this paragraph: When chemicals in solution react, the proper way of writing the chemical formulas of the dissolved ionic compounds is in terms of the dissociated ions, not the complete ionic formula. A complete ionic equation is a chemical equation in which the dissolved ionic compounds are written as separated ions. Solubility rules are very useful in determining which ionic compounds are dissolved and which are not. For example, when NaCl(aq) reacts with AgNO3(aq) in a double-replacement reaction to precipitate AgCl(s) and form NaNO3(aq), the complete ionic equation includes NaCl, AgNO3, and NaNO3 written as separated ions:. Q: A complete ionic equation is a chemical equation in which the dissolved ionic compounds are written as what? A:
A:
output: separated ions

Answer the following question given this paragraph: Understanding the "hows" and "whys" of the world is the goal of science. The term science comes from a Latin word that means "having knowledge. " But science is as much about adding to knowledge as it is about having knowledge. Science is a way of thinking as well as a set of facts. Science can be defined as a way of learning about the natural world that is based on evidence and logic. Q: The term science comes from a latin word that means? A:

OPTIONS:
- were knowledge
- having information
- only knowledge
- having knowledge

Answer: having knowledge

Problem: OPTIONS:
- available safety symbols
- medical safety symbols
- first aid safety symbols
- lab safety symbols
Q: Answer the following question given this paragraph: Lab safety symbols warn of specific hazards, such as flames or broken glass. Knowing the symbols allows you to recognize and avoid the dangers. Q: What should you learn that allows you to recognize and avoid the dangers of specific hazards when experimenting, such as flames or broken glass? A:
Answer: lab safety symbols

Problem:OPTIONS:
- wavelength of a wave
- spectroscopy of a wave
- spread of a wave
- frequency of a wave

Answer the following question given this paragraph: A photon isn't a fixed amount of energy. Instead, the amount of energy in a photon depends on the frequency of the electromagnetic wave. The frequency of a wave is the number of waves that pass a fixed point in a given amount of time, such as the number of waves per second. In waves with higher frequencies, photons have more energy. Q: The number of waves that pass a fixed point in a given amount of time is called what? A:
****
A: frequency of a wave

Problem:OPTIONS:
- a front
- crosswinds
- storm winds
- tradewinds

Answer the following question given this paragraph: The major wind belts push the water in the surface currents. The water moves in the direction of :. Q: In the tropics what are the prevailing winds called? A:
****
A:
tradewinds