The INNER, thicker layer of skin that houses SWEAT GLANDS, OIL GLANDS, HAIR FOLLICLES, NERVE CELLS, BLOOD VESSELS, and FAT CELLS
The OUTER, thiner layer of skin that is made out of EPITHELIAL TISSUE, and living MELANIN CELLS, and houses PORES, and HAIR
Functions of bones
Bones maintain and change the position of body parts with the help of skeletal muscles, bones protect vital organs, bones provide body with support, some bones produce blood cells, and also bones store minerals. These are all...
Are millions of tiny airsacks that branch off of the bronchi (these are located in both lungs)
Is a sack that holds a substance called urine (waste) before it is passed to the URETHRA
A type of muscle tissue that is attached to and moves the skeleton, an voluntary muscle
is the type of muscle tissue found in the walls of many organs and blood vessels in the body, an involuntary muscle
Involuntary VS. Voluntary
Involuntary: Type of muscle that you don't have to think about to move, these muscles run all the important jobs inside the body such as breathing and digesting
Voluntary: Musles that can be moved consciously such as arms and legs
a wider but shorter tube in the digestive system that is used to hold materials that were not digested
a very long, coiled, ring of muscle at the end of the stomach that controls the flow of food
a j-shaped sack that stores food and further digests food, it takes about 6 seconds for food to reach it
Red blood cells
Cells that carry oxygen, people tend to have 20-25 trillion of them on average and about 300 every second
Is a blood vessel that carries blood away from the heart. These blood vessels have thick muscular walls.
They are the smallest vessels. These vessells are so small that the blood cells move through them in single file
These blood vessels come from capillaries. These blood vessels carry blood back to the heart. These blood vessells have much thinner walls than arteries.
2 main organs in the lymphatic system
1. Spleen - this organ gets rid of red blood cells and other foreign matter. It also makes white blood cells that defend the body.
2. Thymus - this gland is the center of immune control. It makes hormones that help white blood cells recognize invaders.
Functions of the Nervous Systems
1. Detects changes in the internal and external environments of the body. 2. Controls and coordinates responses to changes in the body. 3. Integrates the functions and activities of all organ systems.
Central vs peripheral nervous systems
Central Nervous system consist of the brain and the spinal cord. The peripheral nervous system consists of sensory and motor neurons.
Somatic vs autonomic nervous systems
Somatic consists of the spinal and cranial nerves connected to skeletal muscles and skin receptors. These enable us to feel changes we can control. Autonomic consists of cranial nerves connected to non skeletal muscles and glands. These nerves control functions that control breathing, heart beat and organ functions: things we can not control.