32.3 The Integumentary System – We learned that the structures of the integumentary system. The structures include hair, nails, and several types of glands. We learned that there are two layers to the skin. The outer layer called the epidermis has an upper layer of dead cells and an inner layer of rapidly dividing living cells. The living cells make keratin which is the tough fibrous protein that fills dead skin cells. The epidermis also contains cells called melanocytes which make melanin. Melanin is the brown pigment that gives skin its color and protects the skin from UV radiation.
Assignment: Complete Study Guide A Lesson 32.3.

32.3 The Integumentary System – We learned that the skin, hair, and nails make up the integumentary system. This system functions to protect internal organs, regulate body temperature, excrete wastes, gather information about the environment, and produce vitamin D.
Assignment: Work on Packet A Lesson 32.3.

32.2 Studying the Muscular System – We learned how the muscular system interacts with other body systems. Then we learned that muscles consist of bundles of muscle fibers and
each muscle fiber is filled with tightly packed filament bundles called myofibrils.
Assignment: Work on Study Guide A Lesson 32.2.

32.2 Studying the Muscular System – We learned that Italian artist Leonardo da Vinci was one of the earliest scientists to study and correctly portray the human muscular system. Da Vinci used dissection of human corpses to accurately and beautifully draw muscles. We discovered that muscle movement is necessary for moving food through the digestive system, pumping blood through the body, and the diaphragm moving air in and out of the lungs.

32.1 The Skeletal System – We learned the structure of human bones. We discovered what happens when we lose calcium and what causes rickets. We discovered the effect of damaging a growth plate when a child breaks a bone. We explored the development, remodeling, and repair of bones. We learned how cartilage decreases and bone increases as you grow. We learned how joints hold bones together and allow them to move.
Assignment: Complete Study Guide A Lesson 32.1.

I planned for science.

I planned for science.

I planned for science.

32.1 The Skeletal System – We learned how the axial and appendicular skeletal structures work together. We discovered that the functions of the skeleton include support, protection, movement, mineral storage, and blood cell formation. We discovered that not all bones produce blood cells.
Assignment: Work on Study Guide A Lesson 32.1.

32.1 The Skeletal System – We learned that bones are one of the most important tools used to study the evolution of vertebrates, including humans. Due to the structure and composition of bones, they are more likely than other tissues to be preserved after an animal dies. Bones are typically preserved by fossilization. This process replaces organic material in bones with minerals. Paleontologists compare fossilized bones to the bones of living animals to learn more about the anatomy of extinct animals and changes in species over time.