Human Phys MyLab Exam 1

The following are four parts of hepatic (liver) function. Rank them in order of largest to smallest level of organization.

A. A protein expressed on the surface of a hepatocyte (liver cell) that helps glucose move across the plasma membrane

B. The unusual arrangement of blood vessels that delivers nutrients absorbed from the large intestine directly to the liver

C. Small tubes (canaliculi) within the liver that move bile secreted by hepatocytes (liver cells) into ducts that deliver it to the gall bladder for storage

D. Synthesis and exocytosis of serum albumin (a protein) by a hepatocyte (liver cell)

B > C > D > A

Homeostasis is the ability of the body to ……?

Quickly restore changed conditions to normal

Law of mass balance states….. ?

if a substance is to remain constant any gain must be offset by an equal loss.

Which of the following is an example of the law of mass balance?

A. Eating a salty meal causes the kidney to excrete sodium from the body.

B. Middle-aged men who consume large quantities of iron are at risk for developing dementia.

C. Sweating causes a loss of body water and could cause dehydration.

D. Sunburn causes pain.

A. Eating a salty meal causes the kidney to excrete sodium from the body.

Oxytocin is a hormone released in response to cervical dilation. This causes more uterine contractions that will further dilate the cervix. Which type of feedback does oxytocin trigger?

Positive Feedback

You go outside on a very cold day and you start to shiver because you do not have on the proper clothing. The act of shivering would represent what step in a response loop?

Response

You go outside on a very cold day and you start to shiver because you do not have on the proper clothing. The act of shivering would represent what step in a response loop?

Negative feedback loops

You go outside on a very cold day and you start to shiver because you do not have on the proper clothing. The act of shivering would represent what step in a response loop?

Integrating center