1.Meaning of Homeostasis:
A) contributor and provider
* C) same or constant
2.What is the normal pH value for body fluid?
* B) 7.35-7.45
C) 7.55- 7.65
3.An example of the urinary system working with the respiratory system to regulate blood pH would be A) When you hold your breath the kidneys will remove CO2 from your blood B) If you exercise a lot your urine will become more acidic * C) If you develop emphysema the kidneys will remove fewer bicarbonate ions from circulation D) If you hyperventilate the kidneys will counteract the alkalinity by adding hydrogen ions into the blood stream E) None of the above-the urinary system never works with the respiratory system 4.The urge to breathe comes in direct response to:
A) How long it has been since you last took a breath
B) The oxygen concentration of your surrounding environment C) The buildup of nitrogen within your blood stream
* D) The pH of your blood
E) The buildup of blood pressure that occurs when you don't breathe 5.In response to a bacterial infection my body's thermostat is raised. I start to shiver and produce more body heat. When my body temperature reaches 101 degrees, I stop shivering and my body temperature stops going up. This is an example of: * A) Negative feedback
B) A malfunctioning control system
C) Positive feedback
D) A negative impact
6.Which of the follow is an example of a positive feedback?
A) Shivering to warm up in a cold winter storm
B) A cruise control set on your car applies more gas when going up a hill C) You sweat on a hot summer's day and the blood vessels in your skin vasodilate * D) You get cut and platelets form a clot. This in turn activates the fibrin clotting system and more blood forms clots 7.Where is the body's "thermostat" found?
* A) Within the nervous system, in the Hypothalamus
B) Within the integumentary system, in the skin
C) Within the brain, in the corpus callosum
D) Within the Urinary system, in the kidneys
8. What system has little to contribute to the homeostasis of the organism? A) Urinary System
* B) Reproductive System
C) Respiratory System
D) Nervous System
1. Name all of the parts of the integumentary system.
The integumentary system consists of the skin, the subcutaneous tissue below the skin, hair, nails, and assorted glands. 2. Name the cells that produce melanin and describe its function. Melanocytes
These are cells located in the bottom layer of the skin's epidermis and in the middle layer of the eye, the uvea. Through a process called melanogenesis, these cells produce melanin, a pigment in the skin, eyes, and hair. 3. Name and describe the importance of the cutaneous senses. The cutaneous senses are touch, pressure, heat, cold and pain. Their purpose is to provide the central nervous system with information about the external environment and its effect on the skin. 4. Explain how sweating helps maintain normal body temperature. Eccrine sweat glands are coiled tubular glands derived from the outer layer of skin but extending into the inner layer. The sweat glands are controlled by sympathetic cholinergic nerves which are controlled by a centre in the hypothalamus. The hypothalamus senses core temperature directly, and also has input from temperature receptors in the skin and modifies the sweat output, along with other thermoregulatory processes. 5. Explain where on the body hair has important functions, and describe these functions. Hair on the scalp provides insulation from cold for the head. The hair of eyelashes and eyebrows helps keep dust and perspiration out of the eyes. Hair in our nostrils helps keep dust out of the nasal cavities. Any other hair on our bodies no longer serves a function, but is an evolutionary remnant. 6. What is a melanoma?
a. The outermost layer of skin
b. A type of nail disease