The red lines one may notice in the white portion of the eye are in fact tiny blood vessels known as (a)   . Found in all parts of the body, these are microscopic blood vessels that connect arteries and veins. The walls of these vessels are only a single cell thick, which allows easy transport of gases and nutrients between the blood and the cells of the body.

(a)   is found in various structures including the larynx and respiratory tract, the external ear, and at joint surfaces between bones. The primary function of this connective tissue is to provide a matrix or scaffold for flexible structures of the body.

The (a)   is a wide, flat sheet of muscle in the chest cavity that is stretched across the base of the rib cage. During inhalation, this muscle contracts, decreasing pressure in the thoracic cavity and allowing air to be pulled in. During exhalation, this muscle relaxes, exerting pressure on the thoracic cavity, which pushes air out.

The (a)   is a tube-shaped organ of the respiratory system. In humans it is also called the voice box. Air passing over the vocal cords makes them vibrate producing sound.

The (a)   is a membrane-lined part of the throat that is found at the back of the mouth. It leads to both the respiratory system and the digestive system.

The human ___________ ______ is made up of the nose, lungs, trachea, and diaphragm. It works with the circulatory system to supply oxygen to the cells in the body and to remove the waste carbon dioxide.

(a)  

The (a)   or windpipe is a tube that starts just below the larynx and extends toward the lungs where it divides into primary bronchi. It carries air to and from the lungs. It is held open by rings of cartilage.

The ________ ______ is composed of two main parts: axial skeleton and appendicular skeleton. The axial skeleton is made up of the bones of the head, chest, and back. The appendicular skeleton includes the bones of the legs and arms and their associated structures, such as the pelvic girdles and shoulders. This system provides protection, offers support, and enables movement.

(a)  

a band of connective tissue attaching two bones in a joint

(a)  

band of connective tissue that attaches muscle to bone

(a)  

As your body breaks down food and uses nutrients, waste is created. The _________ ______ keeps your body healthy by getting rid of the waste. This e system is made up of the urinary system, digestive system, respiratory system, and the skin. The urinary system removes waste from the blood. The kidneys, bladder, and liver are the major organs in the urinary system.

(a)  

(a)   (plural), often proteins, attack biological cells and induce the formation of antibodies, or antitoxins. Examples of toxins are snake and spider venom, botulism toxin, pufferfish venom, and tetanus.

Humans and other mammals can regulate their internal chemical processes in order to maintain equilibrium, by making constant adjustments as internal and external conditions change. Psychological, physical, and genetic factors can disrupt this process. In the body, this process is controlled by both the nervous and endocrine systems, which use feedback from organs and organ systems to maintain internal chemical balance within the body even when external factors change. (a)   is important in maintaining a constant body temperature, among other things.

The _____ ____ is the region that connects the brain to the spinal cord. It consists of three parts: midbrain, pons, and medulla oblongata.

(a)  

________ __________ is a metabolic process by which cells break chemical bonds of nutrients, such as glucose, to obtain ATP - a useable form of energy

(a)  

An (a)   is a chemical substance that, when dissolved in water, conducts electricity. this word can also refer to the aqueous solution itself.

A reaction that absorbs heat energy is called an (a)   reaction. When barium hydroxide octahydrate crystals are mixed with ammonium chloride, the reaction absorbs energy from the surroundings and a temperature drop, low enough to freeze water, is recorded.

The process in which part of the output of a system is returned to the input to regulate further output.

(a)  

(a)   is a simple carbohydrate produced by plants during photosynthesis. Animals breakdown glucose to produce reusable energy in the form of ATP.

(a)   includes catabolism, the breaking down of molecules, and anabolism, the building up of molecules. Weight gain rarely occurs due to a "slowing" of this process, and is usually due to non-medical factors such as diet and exercise.

A (a)   is a substance that dissolves in a solvent to form a mixture. Salt dissolves in water to form a homogeneous mixture of saltwater.