Bio 23 Section 1-2

Question 1

What is an organism composed of?

Answer 1

Organ systems

Question 2

What are organ systems composed of?

Answer 2

Organs

Question 3

What are organs composed of?

Answer 3

Tissues

Question 4

What are tissues composed of?

Answer 4

Cells

Question 5

What are cells composed of

Answer 5

organelles

Question 6

What are organelles composed of?

Answer 6

Macromolecules

Question 7

What are Macromolecules composed of?

Answer 7

Molecules

Question 8

Organism

Answer 8

is a single, complete individual

Question 9

Organ system

Answer 9

Is a group of two or more organs with a unique collective function.

Question 10

Organ

Answer 10

A structure that is composed of two or more tissue types working together to carry out a particular function.

Question 11

Tissue

Answer 11

A mass of similar cells and cell products that forms a discrete region of an organ and performs a specific function.

Question 12

How many tissue types do we have as humans?

Answer 12

Four: Connective, nervious, muscle, epithelial

Question 13

How many organ systems do we have as a human?

Answer 13

11

Question 14

What is the smallest unit of an organism that carries out all the basic functions of life?

Answer 14

Cells

Question 15

What is the study of cells and organelles?

Answer 15

Cytology

Question 16

What are fats, proteins, and DNA examples of?

Answer 16

Macromolecules

Question 17

What particle is composed of at least two atoms and is considered the smallest particle with unique chemical identities?

Answer 17

Molecules

Question 18

Pathophysiology

Answer 18

the study of unstable conditions that result in homeostatic controls go away

Question 19

The internal state of the body is known as what?

Answer 19

Dynamic equilibrium

Question 20

What is the fundamental mechanism that keeps the variables in the body close to a set point?

Answer 20

Negative feedback.

Question 21

Negative feedback

Answer 21

Process in which the body senses a change and activates a mechanism to navigate and reverse it.

Question 22

Vasodilation

Answer 22

The widening of blood vessels.

Question 23

Vasoconstriction

Answer 23

The narrowing of blood vessels

Question 24

What are the components of a negative feedback loop?

Answer 24

Receptors Control center (brain)Effectors

Question 25

Positive feedback

Answer 25

A self-amplifying cycle in which a physical change leads to a greater change in the same direction.

Question 26

What is an example of positive feedback?

Answer 26

Childbirth

Question 27

What is an example of negative feedback?

Answer 27

Being too hot or being too cold.

Question 28

Homeostasis

Answer 28

Is the body's ability to detect the change, and activate mechanisms that oppose it, thereby maintaining or returning to equilibrium.

Question 29

what is the simplest form of matter to have unique properties?

Answer 29

Chemical Elements

Question 30

Each element of the periodic table is identified by what?

Answer 30

Atomic number

Question 31

Where are the protons and neutrons located?

Answer 31

The nucleus and they are the same numbers.

Question 32

Where are the electrons located?

Answer 32

The outer rings or shells.

Question 33

How many letters or used to represent an element?

Answer 33

One or two letters.

Question 34

The atomic number of an atom is equal to the number of what?

Answer 34

Protons and neutrons.

Question 35

The electrons on the outermost shell are called what?

Answer 35

Valence Electrons

Question 36

What is the purpose of the electrons on the valence shell?

Answer 36

They determine the bonding properties of an atom.

Question 37

All elements have varieties known as.

Answer 37

Isotopes

Question 38

Unstable isotopes are known as?

Answer 38

Radioisotopes

Question 39

The process of decay( breaking down) due to unstable isotopes are known as.

Answer 39

Radioactivity (only the neutrons will be affected)

Question 40

Ions

Answer 40

Are particles that have an unequal number of protons and electrons (+,-). Opposites attract.

Question 41

Anions

Answer 41

Are particles that gain electrons. giving the element a negative charge (-)

Question 42

Cations

Answer 42

Are particles that give or donate an electron. giving that element a positive charge. (+)

Question 43

The charge on an ion

Answer 43

Valence

Question 44

What are Molecules composed of?

Answer 44

Atoms

Question 45

What is the letter representation of Oxygen? And how much percentage does it take up in the body

Answer 45

(O) and 65.00%

Question 46

What is the letter representation of Carbon and the percentage in the body

Answer 46

(C) and 18.00%

Question 47

What is the letter representation of Hydrogen and percentage in the body?

Answer 47

(H) and 10.00%

Question 48

What is the letter representation of Nitrogen and percent in the body?

Answer 48

(N) 3.0%

Question 49

What is the letter representation of Calcium and its percentage in the body?

Answer 49

(Ca) and 1.5%

Question 50

What is the letter representation of Phosphorus and its percentage in the body?

Answer 50

(P) and 1.0%

Question 51

What percentage do the major elements take up in the human body?

Answer 51

98.5%

Question 52

What is an example of physiological variations

Answer 52

Age, weight, diet, Physical activity

Question 53

Who noted fairly constant internal conditions despite changing external conditions?

Answer 53

Claude Bernard (1813- 1878)

Question 54

Who coined the term homeostasis?

Answer 54

Walter Cannon (1871-1945)