ati teas 7 science

Correct Answer: A

Rationale: The correct answer is A: Axon. The axon is responsible for transmitting signals away from the cell body towards other neurons or muscles. It is a long, slender projection of the neuron that carries electrical impulses known as action potentials. The axon is covered by the myelin sheath, which helps to speed up the transmission of signals. Summary: - B: Dendrite receives signals from other neurons and transmits them towards the cell body. - C: Synapse is the gap between neurons where neurotransmitters are released to communicate signals. - D: Myelin sheath insulates and speeds up signal transmission along the axon, but it is not responsible for transmitting signals itself.

Correct Answer: A

Rationale: The correct answer is A: Atom. An atom is the smallest unit of an element that retains its chemical properties. Atoms are composed of protons, neutrons, and electrons. Molecules (B) are made up of two or more atoms bonded together. Compounds (C) are substances composed of two or more different elements chemically bonded. Mixtures (D) are combinations of two or more substances that are physically mixed but not chemically bonded. Therefore, in this context, the correct answer is atom as it specifically refers to the smallest amount of an element that can exist independently with its unique chemical properties.

Correct Answer: D

Rationale: The correct answer is D: Influenza. Influenza is caused by a virus, specifically the influenza virus. Step-by-step rationale: 1. Influenza is a contagious respiratory illness caused by the influenza virus. 2. Viruses are known to be the causative agents of influenza. 3. Asthma (A), Cystic Fibrosis (B), and Epiglottitis (C) are not caused by viruses; asthma is a chronic inflammatory disease, cystic fibrosis is a genetic disorder, and epiglottitis is usually caused by bacteria.

Correct Answer: B

Rationale: The correct answer is B: Lactic acid. When creatine phosphate is used as an energy source for short bursts of muscle activity, it is rapidly broken down into creatine and phosphate. The breakdown of creatine phosphate leads to the production of lactic acid through anaerobic glycolysis. Lactic acid accumulation causes muscle fatigue during intense exercise. A: Glucose is not the breakdown product of creatine phosphate. Glucose is a common fuel for cellular respiration but is not directly produced from creatine phosphate breakdown. C: Carbon dioxide is not the breakdown product of creatine phosphate. Carbon dioxide is produced during the Krebs cycle in aerobic respiration, not from the breakdown of creatine phosphate. D: Creatine is not the breakdown product of creatine phosphate. Creatine is one of the compounds formed when creatine phosphate is broken down, but it is not the final breakdown product.

Correct Answer: B

Rationale: The correct answer is B: Humoral immunity. B-cells produce antibodies that circulate in bodily fluids to combat pathogens. This is a key aspect of humoral immunity. A: Cell-mediated immunity involves T-cells directly attacking infected cells, not antibody secretion by B-cells. C: Innate immunity is non-specific and does not involve B-cells producing antibodies. D: Phagocytic immunity involves phagocytes engulfing and destroying pathogens, not antibody secretion by B-cells.