Homeostasis & Thermoregulation

Question 1

3 examples of positive feedbacks

Answer 1

Blood clotting
Lactation
Parturition

Question 2

What is the difference between the endocrine system and the nervous system?

Answer 2

The endocrine system uses chemical messages that travel in the blood in the form of long-distance cell signaling, while the nervous system transmits information in the form of electrical impulses along nerve cells

Question 3

What type of feedback is thermoregulation?

Answer 3

Negative feedback

Question 4

What are the receptors that detect the change in room temperature?

Answer 4

Peripheral thermoreceptors in skin
Central thermoreceptors in abdominal organ (liver) and hypothalamus

Question 5

What is the effect of a drop in room temperature on arterioles?

Answer 5

Vasoconstriction

Question 6

How body produce heat when cold?

Answer 6

Muscle shivering
The liver generates the most heat due to its highest metabolic rate
Adrenal medulla secretes adrenaline to rise basal metabolism

Question 7

How does our body lose heat when the external environment is hot?

Answer 7

Dilating skin arterioles and constricting shunt vessels to increase skin blood flow to lose heat by radiation

More sweat secretion

Question 8

Sweat secretion is induced by what stimulation?

Answer 8

Sympathetic stimulation

Question 9

What is the composition of sweat gland?

Answer 9

Secretory portion and duct portion

Question 10

What are the symptoms of hyperthermia?

Answer 10

Heat cramps and red moist skin