lesson 2

Question 1

The human body is a single structure but it is made of billions of smaller structures of four major kinds

Answer 1

cells, tissues, organs, and systems

Question 2

is an organization of several different kinds of tissues so arranged that together can perform a special function

Answer 2

Organ

Question 3

is an organization of varying numbers and kinds of organs so arranged that together they can perform complex functions for the body

Answer 3

System

Question 4

Ten major systems include

Answer 4

• the skeletal
• muscular
• nervous
• endocrine
• cardiovascular
• lymphatic
• respiratory
• digestive
• urinary
• reproductive system

Question 5

• A state of balance among all the body systems needed for the body to survive and function correctly
• state of relative constancy, of its internal environment

Answer 5

Homeostasis

Question 6

Life depends on certain physical factors from the environment, which include

Answer 6

water, oxygen, nutrients, heat, and pressure

Question 7

• It gives the body its shape, allows movement, makes blood cells, provides protection for organs, and stores minerals
• it has 98% of the body’s total calcium
• up to 75% of phosphorus

Answer 7

Skeletal system (also the musculoskeletal system)

Question 8

The skeletal system is composed of

Answer 8

206 bones

Question 9

function of the skeletal system

Answer 9

body support, protection, movement, blood cell production

Question 10

• Function Their predominant function is CONTRACTABILITY
• BLANK attached to bones or internal organs and blood vessels
• are responsible for movement

Answer 10

Muscular system

Question 11

The muscular system is composed of specialized cells called

Answer 11

Muscle fiber

Question 12

a system of organs that includes the heart , blood vessels, and blood which is circulated throughout the entire body of a human or other vertebrae.

Answer 12

Cardiovascular system

Question 13

Function of the circulatory system (cardiovascular system)

Answer 13

• Pumps blood from the heart to the lungs to get oxygen.
• The heart then sends oxygenated blood through arteries to the rest of the body.
• The veins carry oxygen-poor blood back to the heart to start the circulation process over

Question 14

to move fresh air into your body while removing waste gases

Answer 14

Respiratory system

Question 15

Once in the lungs, oxygen is moved into the bloodstream and carried through your body. At each cell in your body, oxygen is exchanged for a waste gas called

Answer 15

Carbon dioxide

Question 16

Breaks nutrients into parts small enough for your body to absorb and use for energy, growth, and cell repair

Answer 16

Digestive system

Question 17

to eliminate waste from the body, regulate blood volume and blood pressure , control levels of electrolytes and metabolites, and regulate blood.

Answer 17

Urinary system

Question 18

Also known as the urinary tract or renal system, consists of

Answer 18

the kidneys, ureters, bladder, and the urethra

Question 19

• the system is a messenger system comprising feedback loops of the hormones released by the internal glands of an organism directly into the circulatory system, regulating distant target organs
• made up of all the body’s different hormones, regulates all biological processes in the body from conception through adulthood and into old age, including the development of the brain and nervous system, the growth and function of the reproductive system, as well as metabolism and blood sugar

Answer 19

Endocrine system

Question 20

is the neural control center for all endocrine systems

Answer 20

Hypothalamus

Question 21

• is our body’s sewerage system
• It is part of your immune system. It produces and releases lymphocytes (a type of white blood cell) and other immune cells. These cells look for and destroy invaders — such as bacteria, viruses, parasites, and fungi — that may enter your body
• is important for the optimal functioning of our general and specific immune
• is an organ system in vertebrates that is part of the immune system, and complementary to the circulatory system

Answer 21

Lymphatic system or lymphoid system

Question 22

is a collection of parts able to work together to serve a common purpose, growth, reproduction and survival

Answer 22

Body system

Question 23

the most important organ system in the body

Answer 23

Brain and the nervous system