ati teas 7 science

Correct Answer: B

Rationale: The correct answer is B: Tendons. Tendons are tough connective tissues that attach skeletal muscles to bones. They transmit the force generated by muscles to the bones, allowing movement. Ligaments (A) connect bones to other bones, not muscles. Cartilage (C) is a firm, flexible connective tissue found in joints, not directly involved in muscle attachment. Fascia (D) is a connective tissue that surrounds muscles, but it does not directly attach muscles to bones.

Correct Answer: C

Rationale: The correct answer is C: Vitamin D. Vitamin D plays a crucial role in immune function by regulating the expression of genes involved in immune response. It helps in the production of antimicrobial peptides that defend against pathogens. Vitamin A is important for vision and skin health, not directly related to immune function. Vitamin B12 is essential for neurological function and red blood cell production. Vitamin E is an antioxidant that protects cells from damage but does not have a direct role in immune function. Therefore, the correct choice is Vitamin D as it directly supports immune system function.

Correct Answer: D

Rationale: The correct answer is D: Researching previous studies for background. Before generating a hypothesis, it is crucial to review existing research to build a foundation of knowledge. This step helps identify gaps in current understanding, refine research questions, and ensure the hypothesis is based on existing evidence. Collecting and organizing data (A) occurs after the hypothesis is formulated. Communicating results (B) is the final step after conducting experiments (C). Therefore, the correct order is researching previous studies (D), generating a hypothesis, conducting an experiment, collecting and organizing data, and finally communicating the results.

Correct Answer: D

Rationale: Certainly! The correct answer is D because saltatory conduction is faster than normal nerve conduction (A), occurs from one node of Ranvier to the next (B), and only occurs in myelinated neurons (C). This process involves the rapid transmission of action potentials in myelinated axons, where the impulse "jumps" from one node of Ranvier to the next, skipping the myelinated regions in between. This allows for faster conduction speeds compared to continuous conduction in unmyelinated neurons. Therefore, all of the statements in options A, B, and C are accurate descriptions of saltatory conduction, making option D the correct choice.

Correct Answer: A

Rationale: The correct answer is A: Neuron. Neurons are the fundamental unit of the nervous system because they are specialized cells that transmit information through electrical and chemical signals. Neurons have a unique structure with dendrites, cell body, and axon, allowing them to receive, process, and transmit signals. Nerves (B) are bundles of neurons, ganglia (C) are clusters of neuron cell bodies, and neuroglia (D) are support cells in the nervous system. Neurons are the primary functional unit responsible for communication in the nervous system.