Homeostasis & Negative Feedback Mechanism

The definition of homeostasis is a

• Feedback mechanism in which the response enhances the original stimulus

• Feedback mechanism that stops or reduces the intensity of the original stimulus

• Process of maintaining stable condition of internal environment inside the body

• Process of maintaning stabler condition of environment outside the body

Tags

NGSS.HS-LS1-3

If you skip a meal, which of the following conditions would occur?

• Insulin levels would rise and glucose would be converted into glycogen

• Glucagon levels would rise and glucose would be converted into glycogen

• Insulin levels would rise, and glycogen would be converted into glucose

• Glucagon levels would rise, and glycogen would be converted into glucose

Tags

NGSS.HS-LS1-3

Which of the following occur during hypoglycaemia?

• Stimulate body cells to take up glucose to increase the glucose metabolism

• Stimulate glycogenesis

• Stimulate glycogenolysis

• Increase the rate of conversion of excess glucose into fat in adipose tissue.

Which of the following occur during hyperglycaemia?

• Stimulate body cells to take up glucose to increase the glucose metabolism

• Stimulate glycogenolysis

• Stimulate gluconeogenesis

Tags

NGSS.HS-LS1-3

What is gluconeogenesis?

• the conversion of excess glucose into fat in adipose tissue.

• the conversion of glucose into glycogen in liver and muscle cells

• the breakdown of glycogen into glucose

• the conversion of amino acids and glycerol into glucose

What creates the high hydrostatic pressure needed for ultrafiltration in the glomerulus?

• Narrow afferent arteriole

• Wider efferent arteriole

• Narrow efferent arteriole

• Active transport of sodium ions

Which part of the nephron is most involved in reabsorption of glucose?

• Distal convoluted tubule

• Proximal convoluted tubule

• Loop of Henle

• Collecting duct

The thick segment of ascending limb of the Loop of Henle:

• Is permeable to water

• Allows passive diffusion of glucose

• Actively transports sodium ions out

• Passively transports sodium ions out

A patient has severe dehydration. Which combination of changes would most likely occur?

• Decreased ADH, decreased collecting duct permeability, dilute urine

• Decreased ADH, increased ultrafiltration rate, concentrated urine

• Increased ADH, increased collecting duct permeability, concentrated urine

• Increased ADH, decreased sodium reabsorption, dilute urine

If the efferent arteriole becomes wider than normal, what is the likely effect on ultrafiltration?

• Increased filtration due to higher pressure

• Decreased filtration due to lower glomerular pressure

• No change in filtration rate

• Increased protein filtration