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Flashcards in Unit 2 Deck (64)
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1

What are tissues

A group of similar cells that work together for a particular function

2

What are organs

A structure made of a group of tissues working together to perfoerm a function

3

Name 3 facts about stem cells

They are in specialized cells in animals
They can divide and become specialized cells by variation
Stem cells are needed for growth and repair

4

Name the 10 places you can find stem cells

Brain, blood vessels, skeletal muscle, peripheral blood, bone marrow, teeth, skin, heart, liver, gut

5

What are meristems

Sites of cell division in plants
Eg root and shoot tips

6

What can unspecified meristems do

Grow into specialized plant cells eg xylem

7

Name the three parts of the central nervous system

Brain
Spinal cord
Nerve cells

8

Name the three parts of the brain

cerebrum, cerebellum, medulla

9

State the function of the cerebrum

Controls memory, personality and conscious thought

10

State the function of cerebellum

Controls balance and coordination

11

State the function of the medulla

Controls heart rate and breathing rate

12

What's is a reflex arc

The sequence of neurons a nervous impulse passes through to cause a reflex action

13

What is the order of neurons In a reflex arc?

Sensory, relay, motor

14

What is a reflex action

A rapid automatic response to a stimulus

15

What's the sequence in reflex action

Sense receptor, sensory neuron, relay neuron, motor neuron, effector(muscle)

16

What is a synapse and what happens

A gap between two neurons
Signals are passed across this junction by chemical messengers called neortansmitters

17

How do signals travel along nerves

By electrical impulses

18

Name three facts about hormones

Chemical messengers
Made by endocrine glands
Transported around the body by the blood

19

Which 6 places in e body do you find endocrine glands

Testis, ovary, pancreas, adrenal, thyroid, pituitary

20

Why is glucose needed

To make ATP

21

What controls levels of glucose in the blood

Hormones insulin and glucagon

22

When is glucagon produced

When glucose is gone

23

When controlling glucose levels in high blood pressure, what are the 4 stages

Too much glucose in blood
pancreas produces more insulin
Increase glucose uptake by cells and glycogen formation
Blood glucose levels decrease

24

When controlling glucose levels in low blood pressure, what are the 4 stages

Too little glucose in blood
Pancreas,produces more glucagon
Breakdown of glycogen in liver
Blood glucose levels increase

25

What are all sex cells known as

Gametes

26

Name 4 facts about sperm

Small
Has tail to swim
Many produced
Contains nucleus

27

Name 4 facts about female eggs

Large
Less produced
Contains nucleus
Contains food source

28

When does sexual reproduction occur

When generic information from two sexes are combined

29

When does fertilization occur

When the nucleus of a male gamete fuses with nucleus of female gamete

30

What is the cell produced when a male and female gamete fuse called

Zygote