Organization of Human Body 27.1-3

The basic unit of structure in the human body is __.

Cells

Groups of cells that form a particular function are known as __.

Tissues

The four main types of tissues in the body are __, connective, nervous, and muscle.

Epithelial

The __ is a group of tissues that comes together to perform single or several related functions.

Organ

The __ system performs closely related functions to maintain homeostasis.

Organ systems

Homeostasis describes the relatively constant __ conditions that organisms maintain despite changes in the environment.

internal

Through __ inhibition, internal conditions are kept within a certain range, never too far one way or the other.

Feedback

The liver converts ammonia, a toxic by-product, to __, which is less toxic.

urea

Excretion is the process by which __ waste products are eliminated from the body.

metabolic

The major organ of excretion in the human body is the __.

Kidney

The process of __ involves blood returning to the heart after circulating through the body and absorbing carbon dioxide.

Systemic circulation

The three types of proteins found in plasma are albumin, globulins, and __.

fibrinogen

The role of __ in blood is to transport oxygen.

Red blood cells

When a capillary wall breaks, the __ initiate the clotting process by clumping and releasing clotting factors.

platelets

The __ system collects lymph that leaves capillaries, screens it for microorganisms, and returns it to the circulatory system.

Lymphatic

Gas exchange occurs in the __ of the lungs, where oxygen diffuses into the blood.

alveoli

The diaphragm contracts and flattens to create a partial vacuum in the chest cavity during __.

inhalation

The __ regulates breathing by sending nerve impulses to cause contraction of the diaphragm and chest muscles.

medulla oblongata