1. Read the paragraphs below. For each paragraph, write the letter of the diagram from the diagram sheet entitled Effects of Nicotine and NicoBlock that best illustrates the information. When someone smokes tobacco, nicotine is inhaled and travels through the bloodstream from the lungs to the brain. Nicotine then attaches to the nicotine receptors in the brain and triggers brain cells to release a neurotransmitter (chemical messenger) called dopamine. The release of dopamine in the brain results in a feeling of pleasure. The effect of nicotine only lasts for a short time. When someone quits smoking, there is no nicotine to trigger the release of dopamine needed for a feeling of pleasure. NicoBlock is designed to interfere with the brain mechanisms that cause smokers to crave nicotine and continue smoking. NicoBlock attaches to nicotine receptors and triggers the production of small amounts of dopamine, a neurotransmitter that leads to a pleasure sensation. Once NicoBlock attaches to the nicotine receptors, it remains in and blocks the receptors. Because the nicotine receptors are blocked by NicoBlock the brain cell receptors cannot bind to nicotine any more. Therefore, if someone smokes while using NicoBlock, nicotine cannot trigger the release of dopamine. Effects of Nicotine and NicoBlock on the Brain

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Musculoskeletal System

The musculoskeletal system, also called the locomotor system, is an organ system that gives humans and animals the ability to move using their muscular and skeletal systems. It provides stability, form, support, and movement to the body. The skeleton is composed of bones (skeleton), muscles, cartilage, tendons, ligaments, joints, and other connective tissue that supports and binds tissues and organs together. The musculoskeletal system is subdivided into two broad systems, such as the muscular system and the skeletal system.

Skeletal structure

The skeletal system is the core framework of the human body. The skeletal structure comprises bones and connective tissue, including cartilage, ligaments, and tendons. The skeletal structure of our body acts as a support structure. It maintains the body's shape and is responsible for its movement, blood cell formation, protection of organs, and mineral storage. The skeletal system is referred to as the musculoskeletal system.