Answer the following question given this paragraph: 10.3 Muscle Fiber Contraction and Relaxation A sarcomere is the smallest contractile portion of a muscle. Myofibrils are composed of thick and thin filaments. Thick filaments are composed of the protein myosin; thin filaments are composed of the protein actin. Troponin and tropomyosin are regulatory proteins. Muscle contraction is described by the sliding filament model of contraction. ACh is the neurotransmitter that binds at the neuromuscular junction (NMJ) to trigger depolarization, and an action potential travels along the sarcolemma to trigger calcium release from SR. The actin sites are exposed after Ca++ enters the sarcoplasm from its SR storage to activate the troponin-tropomyosin complex so that the tropomyosin shifts away from the sites. The cross-bridging of myposin heads docking into actin-binding sites is followed by the "power stroke"the sliding of the thin filaments by thick filaments. The power strokes are powered by ATP. Ultimately, the sarcomeres, myofibrils, and muscle fibers shorten to produce movement. Q: What is the smallest contractile portion of a muscle? A:

OPTIONS:
- filaments
- cell
- capillary
- sarcomere

Answer: sarcomere

Problem: OPTIONS:
- potential energy
- electromagnetism
- deformed energy
- electrical energy
Q: Answer the following question given this paragraph: Electrons are negatively charged particles in atoms. Moving electrons have a form of kinetic energy called electrical energy . If you've ever experienced an electric outage, then you know how hard it is to get by without electrical energy. Most of the electrical energy we use is produced by power plants and arrives in our homes through wires. Two other sources of electrical energy are pictured in Figure below . Q: Moving electrons have a form of kinetic energy called what? A:
Answer: electrical energy

Problem:OPTIONS:
- sheen
- energy
- shine
- porosity

Answer the following question given this paragraph: Identify features caused by groundwater erosion and deposition. Q: Water infiltrates the ground because soil and rock may have air spaces between the grains. these pores, or tiny holes, result in the rock's what? A:
****
A: porosity

Answer the following question given this paragraph: Cooling or evaporation of fresh water from the sea surface makes surface water dense. This causes the surface water to undergo downwelling. Q: Cooling or evaporation of what from the sea surface makes surface water dense? A:
OPTIONS:
- dirty water
- salt water
- warm water
- fresh water
fresh water

Answer the following question given this paragraph: Figure 6.20 According to early accounts, Newton was inspired to make the connection between falling bodies and astronomical motions when he saw an apple fall from a tree and realized that if the gravitational force could extend above the ground to a tree, it might also reach the Sun. The inspiration of Newton's apple is a part of worldwide folklore and may even be based in fact. Great importance is attached to it because Newton's universal law of gravitation and his laws of motion answered very old questions about nature and gave tremendous support to the notion of underlying simplicity and unity in nature. Scientists still expect underlying simplicity to emerge from their ongoing inquiries into nature. Q: According to early accounts, newton was inspired to make the connection between falling bodies and astronomical motions when he saw an apple fall from a tree and realized that if the gravitational force could extend above the ground to a tree, it might also reach this? A:
OPTIONS:
- stars
- moon
- horizon
- sun

Answer: sun

input with options: Answer the following question given this paragraph: Three main types of particles that make up all atoms are protons, neutrons, and electrons. Q: Which state of matter is characterized by molecules with minimal movement and strong forces between them? A:
OPTIONS:
- plasma
- liquid
- gas
- solid
output:
solid