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bazaltina [42]
3 years ago
13

Question 15 the decrease in estrogen in postmenopausal women plays a part in the increased risk of heart disease that occurs in

older women.
a. True
b. False
Biology
1 answer:
denis-greek [22]3 years ago
3 0
The statement above is TRUE.
The estrogen hormone prevents women from developing some types of heart diseases. Before the stage of menopause, women produce adequate amount of estrogen which prevent them from developing certain types of heart diseases but after the menopause has been reached, the risk for heart diseases increases in women.<span />
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In the food pyramid, the greatest biomass appears at the level of A) Birds and Mammals. B) Insects and Zooplankton. C) Phytoplan
Romashka [77]
I think the answer should be:<span>D) Small Fish and other Aquatic Species
</span><span>
In food pyramid, the biomass will be much lower in the higher level. In general, every level will have lower of mass/energy compared to the level below. Then, the greatest biomass should be found in the producer class. High-level consumer like bird or mammals should have the lowest mass. 
But it was inverted in aquatic, producer become the lowest mass so phytoplankton and zooplankton must be lowest. You should be able to exclude option A and C so it is either option B or D. Since B has zooplankton, I prefer to choose D
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6 0
3 years ago
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Las estructuras que facilitan la union de las venas y arteriasel intercambio gaseosos entre los dintistos tejidos y la sangre qu
AfilCa [17]

Answer:

Intercambio de oxígeno y dióxido de carbono

Por 

Rebecca Dezube

, MD, MHS, Johns Hopkins University

Última revisión completa jun. 2019

HACER CLIC AQUÍ PARA LA VERSIÓN PARA PROFESIONALES

La principal función del aparato respiratorio es inhalar oxígeno y eliminar dióxido de carbono. El oxígeno inhalado penetra en los pulmones y alcanza los alvéolos. Las capas de células que revisten los alvéolos y los capilares circundantes se disponen ocupando el espesor de una sola célula y están en contacto estrecho unas con otras. Esta barrera entre el aire y la sangre tiene un grosor aproximado de una micra (1/10 000 cm). El oxígeno atraviesa rápidamente esta barrera aire–sangre y llega hasta la sangre que circula por los capilares. Igualmente, el dióxido de carbono pasa de la sangre al interior de los alvéolos, desde donde es exhalado al exterior.

La sangre oxigenada circula desde los pulmones por las venas pulmonares y, al llegar al lado izquierdo del corazón, es bombeada hacia el resto del organismo (véase Función del corazón). La sangre con déficit de oxígeno y cargada de dióxido de carbono vuelve al lado derecho del corazón a través de dos grandes venas: la vena cava inferior y la vena cava superior. A continuación, la sangre es impulsada a través de la arteria pulmonar hacia los pulmones, donde recoge el oxígeno y libera el dióxido de carbono.

Intercambio de gases entre las alveolas y los capilares

Para mantener la absorción de oxígeno y la emisión de dióxido de carbono, entran y salen de los pulmones entre 5 y 8 L de aire por minuto, y cada minuto se transfiere alrededor del 30% de cada litro (cerca de tres décimos de galón) de oxígeno desde los alvéolos hasta la sangre, aun cuando la persona esté en reposo. Al mismo tiempo, un volumen similar de dióxido de carbono pasa de la sangre a los alvéolos y es exhalado. Durante el ejercicio, es posible respirar más de 100 L de aire por minuto y extraer de este aire 3 L de oxígeno por minuto. La velocidad de entrada del oxígeno en el organismo es una medida importante de la cantidad total de energía consumida por este. La inspiración y la espiración se llevan a cabo gracias a los músculos respiratorios.

4 0
3 years ago
What are the contributions of pacemakers for human life?
givi [52]
It helps keep the heart beating at a steady pace so that it doesn't beat to slow or to fast, it helps prevents heart attacks.
6 0
4 years ago
Why are getting sleepy????​
grin007 [14]
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I hope that answers your question
8 0
4 years ago
BRAINLIESTTT ASAP!! PLEASE HELP ME :)
leva [86]

<em>Rosalind Franklin decided she wanted to be a scientist at age 15. She trained as a chemist, was an expert in deducing the structure of molecules by firing X-rays through them. Her images of DNA  were used without her knowledge, where she later went on to do pioneering work on the structures of viruses. </em>

<em>She died of ovarian cancer at age 37, before she could be recognized for the magnitude of her work.</em>

Rosalind Franklin's critical contributions were the understanding of molecular structures of RNA, DNA, certain viruses, coal and graphite. Franklin contributed that DNA molecules are shaped like a twisted ladder. Her photographs and studies provided evidence that DNA is made up of more than a single strand of nucleotide's.

She innovated the resolution of the cameras used in order to obtain the most detailed images yet of X-ray diffraction of DNA. The detailed images allowed her to make <em>exact </em>measurements related to the structure of DNA.

7 0
3 years ago
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