5.20.24

What are the two main parts of the nervous system?

• Major nervous system and minor nervous system
• Brain system and spinal system
• Upper nervous system and lower nervous system
• Central nervous system (CNS) and peripheral nervous system (PNS)

What is myelin and the myelin sheath?

• Myelin is a type of neurotransmitter, while the myelin sheath is a layer of connective tissue surrounding nerve fibers.
• Myelin is a protein that conducts nerve impulses, while the myelin sheath is a layer of skin protecting nerve fibers.
• Myelin is a fatty substance that insulates nerve fibers, while the myelin sheath is the protective covering made up of myelin surrounding nerve fibers.
• Myelin is a type of cell found in the brain, while the myelin sheath is a layer of blood vessels supplying nutrients to nerve fibers.

List the parts of a neuron.

• Axon terminal, cytoplasm, Schwann cell
• Dendrites, cell body (soma), axon
• Neurotransmitter, mitochondria, cerebellum
• Synapse, nucleus, myelin sheath

Compare the characteristics of the dermis and the epidermis.

• The dermis is transparent, while the epidermis is opaque.
• Both the dermis and epidermis are equally thick and do not have any distinguishing features.
• The dermis is thicker and contains blood vessels, nerves, and hair follicles, while the epidermis is thinner and acts as a protective barrier.
• The dermis is thinner and lacks blood vessels, nerves, and hair follicles, while the epidermis is thicker and contains these structures.

What is keratin?

• A fibrous structural protein found in hair, nails, and the outer layer of skin.
• A chemical element
• A type of fruit
• A musical instrument

What organs make up the integumentary system?

• muscles, bones, heart
• skin, hair, nails, exocrine glands
• liver, pancreas, spleen
• lungs, kidneys, stomach

Which types of muscle are under conscious control?

• Skeletal muscles
• Nervous muscles
• Smooth muscles
• Cardiac muscles

What are the three types of muscle tissue?

• cardiac muscle, smooth muscle, and striated muscle
• skeletal muscle, cardiac muscle, and smooth muscle
• heart muscle, digestive muscle, and skeletal muscle
• voluntary muscle, involuntary muscle, and striated muscle

Identify the three types of specialized bone cells.

• Osteoblasts, osteocytes, and osteoclasts
• Osteoblasts, osteoclasts, fibroblasts
• Osteoblasts, osteocytes, chondrocytes

Which body systems regulate other organ systems to maintain homeostasis?

• Nervous system and endocrine system
• Circulatory system and lymphatic system
• Respiratory system and digestive system
• Muscular system and skeletal system