Identify the layer of skin labeled A that contains cells with keratin and melanin.
Epidermis
Dermis
Subcutaneous layer
Nerve tissue layer
What characteristic of skin is important for bone formation?
Sweat absorbs body heat when it evaporates and cool skin.
Vitamin D is made when skin is exposed to ultraviolet light.
Nerve endings in the dermis protect from scrapes and breaks.
Intact skin prevents entry of many microorganisms and foreign substances.
What type of tissue is located at the area labeled A in the illustration below.
Compact bone
Spongy bone
Marrow
D.cartilage
Where is spongy bone located in the diagram above?
A
B
C
D
What produces red and white blood cells and platelets?
Red bone marrow
Yellow bone marrow
Osteoblasts
Osteoclasts
Which type of muscle is under conscious control?
Smooth muscle
Skeletal muscle
Cardiac muscle
Involuntary muscles
In the illustration below, what is the structure labeled B?
Dendrite
Axon
Nucleus
Cell body
Which structure in the illustration above receives impulses?
A
B
C
D
How do impulses move at a synapse?
By an electrical charge
By a chemical neurotransmitter
By touching the next neuron
By osmosis
Which is part of the integumentary system?
Bone
Ligament
Organ
Skin
Which is a sign of first-degree sunburn?
Blisters
Mild epidermal redness
Muscle and tissue damage
Scarring
Which explains why a person’s skin become darker when frequently exposed to sunlight?
Cells in the dermis layer become thicker and layered.
Epithelial cells in the epidermis stretch to protect tissues.
Exposure to sunlight causes melanin to be produced.
Sebaceous glands secrete additional oil for protection.
How does the skin regulate body temperature?
By increasing sweat production
By retaining water
By producing vitamin D
By regulating fat content in the epidermis
What are the cells that remove old bone tissue called?
Osteoblasts
Osteocytes
Osteoclasts
Osteozymes
Which is not part of the axial skeleton?
skull
ribs
hip bone
vertebral column
Which is a characteristic of fast-twitch muscle fibers?
They contain more myoglobin than slow-twitch fibers
They are resistant to fatigue
They have fewer mitochondria than slow-twitch fibers
They require high amounts of oxygen in order to function
Which is the gap between the axon of one neuron and the dendrite of a second neuron?
Nerve impulse
Node
Reflex arc
Synapse
Which is the result of the actions of the sodium-potassium pump?
negative charge inside a neuron
no charge inside the neuron
no charge outside the neuron
positive charge inside a neuron
If the portion indicated by the arrow was damaged as a result of trauma, what effect would this person most likely experience?
Partial or complete memory loss
Body temperature fluctuations
Trouble maintaining balance
Rapid breathing
Which structure would be most active if you were in a hot, dry desert without water?
Medulla oblongata
Pons
Cerebrum
Hypothalamus
What is true about reflexes?
They travel to the brain on sensory neurons.
They travel to the brain on motor neurons.
They are controlled voluntarily.
They are processed in the spinal cord and not in the brain.
What transmits impulses from pain, heat, and touch receptors in the skin and other body organs?
Interneurons
Motor neurons
Sensory neurons
Free nerve endings
Which nervous system is the hypothalamus most involved in regulating?
Voluntary
Peripheral
Sensory
Autonomic
Which directly controls a person’s decision to use the bicep muscles to lift a barbell?
autonomic nervous system
central nervous system
parasympathetic nervous system
somatic nervous system
Which is caused by the sympathetic nervous system?
contracted bronchial muscle
dilated pupil
increased intestinal secretions
slowed heart rate