SBI unit 4 circulatory

Question 1

What is coronary heart disease, angina, stroke, Rheumatic heart disease, congenital hear disease,

Answer 1

coronary heart disease: blood supply to heart is blocked by fatty substance in the coronary

angina: heart not enough blood + oxygen

stroke: brain get no blood :(

Rheumatic heart disease:heart valves damaged

congenital heart disease: a lot of fucked up heart structure problems

Question 2

What is diffusion?

Answer 2

Air moves from highly concentrated air in lungs → non-concentrated area in bloodstream → air moved through bloodstream to tissue

Question 3

what is countercurrent exchange?

Answer 3

Oyxenagated water flows over gills, while de-oxenagted blood in capillaries flow the opposite direction
Oxygen passes from the water to the deoxegated blood cuz diffusion

Question 4

Functions of circulatory system

Answer 4

1. Transport gasses, nutrients, waste, and chemical substances from other systems
2. Regulate internal temperature
3. Protect against blood loss and diseases

Question 5

Double Circulatory Systems

Answer 5

1. The circulatory system in mammals
2. Keeps circulating oxenagated and deoxygenated blood circulating separately
3. Pulmonary circulation: **blood goes heart → lungs →heart **
4. Systematic circulation: blood goes heart →body
5. Cardiac circulation: rout of blood within the heart

Question 6

whats in blood?

Answer 6

55% plasma(volume, and pressure of blood)

45% solid portions (red blood cells, white blood cells, and platetes)

• red blood cells:no nucleolus, deliever gasses
• white blood cells:fight infection has nucleolus
• platetes: no nucleus, short life span, secretes fibrin to helps blood clotting

Question 7

What is hemoglobin?

Answer 7

The molecule that carries oxygen in red blood cells

Question 8

closed vs open circulatory system.

Answer 8

Closed: continuous flow one dirrection

open: enters body cavitites and re-enters vessels through tiny pores