BC: The End
FC: Final Assessment Project
1: The Integumentary System
2: Epidermis -made up of epithelial tissue | JOB: The Epidermis is responsible for the protection of the inner layers.
3: The Epidermis absorbs nutrients, and homeostasis takes place. There is also keratinocytes, which produce keratin. Keratin is a fibrous protein that aids in protection. The majority of the skin is kertinized, or waterproof.
4: Most cells in the Epidermis are called squamous cells. The Epidermis also has melanocytes which give your skin color and produce melanin; they are found deep in the Epidermis. Melanin package melanosomes which form a pigment shield against UV radiation
6: The Dermis
7: The dermis has two layers: Papillary: make depressions and impressions of fingerprints. In this layer there are receptors which communicate with the central nervous system and respond to touch. Recticular: made of dense elastic fibers. It houses hair follicles, nerves, and glands.
8: Hypodermis | Has addipose tissue and is used for fat storage. The Hypodermis's function is to insulate, store energy and aids in the anchoring of the skin.
9: Receptors: -Meissner's corpuscles are common in the tips of the fingers and lips. They are sensitive to touch. -Pacinian corpuscles respond to pressure. Glands: -Sebaceous glands secrete an oily coating in the hair shaft. If plugged or infected, it becomes a skin blemish or pimple. -Sweat glands open up to the surface through skin pores. -Exocrine glands are a type of sweat gland and they occur all over the body. -Apocrine glands are also a type of sweat gland. They are larger than exocrine glands and occur in the armpits and groin areas. They produce a solution that bacteria act upon to produce "body odor". | Glands and Receptors
10: Nervous System
11: Neurons have three parts: 1. The cell body; contains nucleus. 2. Dendrites; hair like structures surrounding the cell body, which conduct incoming signals. 3. The Axon(nerve fiber) conduct outgoing signals emitted by the neuron. They are enclosed in a fat-like sheath, called myelin, which acts like an insulator and speeds impulse transmission.
12: Typically a neuron is connected to many thousands of other neurons. The synapse is the point of contact between the two neurons. Messages are passed to and from the brain by electrical impulses called action potentials.
13: At the synapse, the impulse causes a release of neurotransmitters and this drives the impulse to the next neuron. These impulses travel about 250mph.
14: Skeletal System
15: Long Bone | Short Bone | Flat Bone | Sesamoid Bone | Irregular Bone | The different bone types:
16: Purposes: 1. Long bones- provides support and allow us to create movement. 2. Short bones- allow movement, provide elasticity and flexibility, and shock absorption. 3. Flat bones- protects and provides attachment sites for muscles. 4. Irregular bones- supports weight, protects spinal cord, contributes to movement and provides sites for muscle attachment. 5. Sesamoid bones- alters the angle of insertion of the muscle
17: The bone consists of three layers: 1) The Periosteum, or the outside skin of bone. 2) The hard compact bone, supports weight of the body 3)Spongy bone, or bone marrow; occurs at ends of long bones.
18: The spongy bone of the femur, humerus and sternum contains red blood cells, white blood cells, or platelets. Yellow marrow is used to store fat.
19: The skin is smooth and flat allowing the under layers to take up less space. | The nerves are thin and slick allowing them to fit into small spaces in the body. | The structure of the skeletal system is straight and compact allowing it to hold up the weight of the body. | How the structure relates to its function