Lecture 4

Question 1

What are the main phases of cell cycle

Answer 1

1. Interphase( cell grows and synthesize)
   2.Mitosis(division of the nucleus)
2. Cytokinesis(Division of cytoplasm)

Question 2

Chromosomes

Answer 2

Condensed DNA during cell division

Question 3

Gene

Answer 3

Portion of DNA molecule that has genetic info

Question 4

Genome

Answer 4

complete set of genetic instructions

Question 5

Interphase

Answer 5

1.When the cell grows and synthesizes new molecules, membranes, DNA and organelles
2.During the g1 and g2 phase, the cells grows and structures
3.During the synthesis phase, the DNA is replicated for cell division

Question 6

Stages of Mitosis. Prophase 1

Answer 6

1. Dna condenses into visible chromosomes
   2.Centrioles migrate to poles
   3.Microtubules organize into spindle fibres
   4.Nuclear membrane and nucleolus disassemble

Question 7

Metaphase

Answer 7

1.Spindle fibres attach to centromeres
2.Chromosomes randomly align midway between centrioles

Question 8

Anaphase

Answer 8

1.Sister chromatids pulled apart
2.Chromatids now individual chromosomes
3.Chromatids are pulled along spindle fibres toward opposite centrioles

Question 9

Telophase

Answer 9

1.Final stage
2.Chromosomes complete their migrations to opposite sides of dividing cells
3.A nuclear envelope and nucleolus assemble for each new cell
4.Spindle fibers disassemble
5.Chromosomes inbond, taking back their chromatin form.

Question 10

Cell divisions stops when…

Answer 10

Telomeres shorten too much

Question 11

Epithelial

Answer 11

1.Protection, secretion, absorption and excretion
2.Covers body surface, internal organs and compose glands
3.Lacks blood vessels, readily divide ,cells are tightly packed

Question 12

Connective

Answer 12

1.Bind, supports, protects, fills spaces, stores fat and produces blood cells
2.Throughout body
3.Good blood supply, cells have extracellular matrix in between

Question 13

Muscle

Answer 13

1.Movement
2.Attached to bones, the walls of hollow internal organs
3.Contracts in response to specific stimulli

Question 14

Nervous

Answer 14

1.Conducts impulses for coordination, regulation and sensory reception
2.Brain, spinal cord and nerves
3.Cells communicate with each other and body parts

Question 15

Simple squamous epithelium

Answer 15

1.Filtration, diffusion, covers surface
2.Air sacs of the lungs, walls of capillaries, blood and lymph vessels, part of the membranes lining body cavities

Question 16

Simple Cuboidal epithelium

Answer 16

1.Protection, Secretion
2.Surface of ovaries, linings of kidney tubules and ducts of certain glands

Question 17

Simple columnar epithelium

Answer 17

1.Protection, secretion and absorption
2.Lining of uterus, stomach and intestines

Question 18

Pseudostratified columnar epithelium

Answer 18

1.Protection, secretion, movement of mucus
2.Linings of respiratory passages

Question 19

Stratified Squamous epithelium

Answer 19

1.Protection
2.Superficial layer off skin, linings of oral cavity, throat vagina and anal

Question 20

Stratified cuboidal epithelium

Answer 20

1.Protection
2.Linings of ducts of mammary glands, sweat glands, salivary and pancreas

Question 21

Stratified columnar epithelium

Answer 21

1. Protection, secretion
2. Part of the male urethra and linings of large ducts

Question 22

Transitional epithelium

Answer 22

1.Stretchability, protection
2.Inner lining of urinary bladder and ureters and part of urethra

Question 23

Areolar Tissue

Answer 23

1.Binds organs
2. Beneath skin, between muscles

Question 24

Adipose tissue

Answer 24

1.Protects, insulates and stores fat
2.Beneath skin, around kidneys, behind eyeballs on surface of heart

Question 25

Reticular connective tissue

Answer 25

1. Supports
   2.In walls over liver and spleen

Question 25

Dense connective tissue

Answer 25

1.Binds body parts
2.Tendonds, ligaments, deep layer of skin

Question 26

Bone

Answer 26

1.Supports, protects and absorbs shock
2.Bones of skeleton

Question 27

Blood

Answer 27

1. Transports substances, helps maintain stable internal environment
2. Throughout body within a closes system of blood vessels and hear chambers

Question 28

What are the three types of muscle tissue?

Answer 28

1.Skeletal
2. Smooth
3.Cardiax