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3 years ago

The entire circulatory system is lined with a _____.

Biology

2 answers:

Alisiya [41]3 years ago

7 0

Answer: Option B.

One cell thick layer of flattened cells.

Explanation:

The circulatory system is a system or network in the body that consist of blood, blood vessels i.e arteries and veins , microvessels, lymph vessels and the heart. They are lined by simple squamous epithelium tissue, these tissue is one cell thick layer of flattened cells. These type of cells are flat with flattened nuclei and are permeable, that is they allow the passage of small molecules through filtration and diffusion. The circulatory system help to circulate blood through out the body from the heart.

Charra [1.4K]3 years ago

5 0

Answer:

ONE-CELL-THICK LAYER OF FLATTENED CELLS

Explanation:

The circulatory system is lined by a simple squamous epithelium which is a one cell thick layer of flattened cells. It allows for passage of small molecules through the process of filtration and diffusion, The kind of epithelium is found in areas that require rapid diffusion of substances such as capillaries, alveoli, glomeruli of nephron. This epithelium is one celled to the basal lamina and contains flat cells.

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"reinforcement is most likely to occur when ________."

Troyanec [42]

Answer B did this a few ago

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3 years ago

A population of wolves predates a population of moose on Isle Royale, Michigan, where there are fewer wolves than moose to start

andrew11 [14]

Complete question:

A population of wolves predates a population of moose on Isle Royale, Michigan, where there are fewer wolves than moose to start. The wolves prey on the moose and eat well, allowing them to have abundant offspring. However, as the wolf population rises, the moose population drops, and over time, the wolf population begins to drop also because of the reduced availability of resources. As the wolf population drops, moose are able to better survive and reproduce, causing the moose population to rise. With this abundance of moose, the wolf population is able to rebound until their population exceeds the moose population’s ability to support the number of wolves. Which population dynamic does this series of oscillations represent?

Delayed density dependence
Delayed density independence
Extinction vortex
Carrying capacity

Answer:

Delayed density dependence

Explanation:

The Delayed density dependence occurs when two species are in interaction (prey-predator or parasite-host), and the dynamic of each population follows the dynamic of the other population. The natality and mortality rates of one species follow the rates of the other species.

Delayed density dependence dynamics regulate populations and allow the occurrence of equilibrium or balance in nature.

Predator-prey scenarios

Assuming that the prey lives in the ideal environment with no predators, it shows an exponential growth rate. Prey can grow, develop, and reproduce, increasing its population size. The more available items, the more predator there will be. The predator population increase in size, and its presence affects the prey populations, leading it to decrease. So there are fewer available items to prey on.

The prey population also affects the predator population. After the increase in the predator population size, the number of available prey decreases. The predator lives in an ideal environment but depends on the prey density. The more predators there are, the fewer prey there will be left. The predator population decreases exponentially due to the item's lack. The predation rate depends on density as well as natality and mortality rates.

So, to sum up,

prey population increases in size
predator population increases in size
prey population decreases in size
predator population decreases in size

In this particular example, the wolves population follows the moose population and vice-versa. It is not simultaneous. It happens with a delay.

Moose influences the wolf population because they are their source of food. The more moose, the more wolves there are. The fewer moose, the fewer wolves there are.

This is a density-dependent dynamic because both populations are affected when they reach a high value.

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3 years ago

The Brazil nut tree, Bertholletia excels (n = 17), is native to tropical rain forests of South America. It is a hardwood tree th

Anna71 [15]

Answer:

Answer is option A.

Orchid bees are to Brazil nut trees as breezes are to pine trees.

Explanation:

In Brazil nut trees, the female orchid bees act as pollinators that help in pollination. In pine trees, wind or breeze helps in pollination.

Pine trees are gymnosperms and so they do not have flowers to attract pollinators like bees or butterflies or birds. They are wind-pollinated. Pine trees are monoecious i.e., both male and female reproductive structures (pine cones) are present on the same tree.

The male cones (catkins) produce pollen grains that are lightweight, less sticky and have air bladders or small wing-like structures. As a result of these features, the pollen grains can be easily carried and dispersed by the breeze. In order to prevent self pollination (pollen falling on the female cones of the same tree), the male cones are normally located on the lower branches of the pine tree.

The female cones are located on the upper branches of the tree and the center of the cone contains eggs or ovules. The pollen grains that are carried by the wind, fall on the female cone of another pine tree. Each pollen grain grows a pollen tube into the center of the cone and the nucleus cell of the pollen travels through the tube and reaches the egg, where it combines with the egg to form an embryo. The embryo eventually grows into a seed. The seeds of pine trees are then dispersed by wind or animals such as squirrels.

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3 years ago

What are chromosomes

Ilya [14]

Chromosomes are thread-like structures in which DNA is tightly packaged within the nucleus.

5 0

3 years ago

Read 2 more answers

Transmission of information along the axon takes place via an electrochemical process called the _____.

Brilliant_brown [7]

Answer: Neurotransmission

Explanation:

The transfer of the information from one neuron to another takes place through the release of the chemical substances from the axon of one neuron to the dendrite of another via synaptic junction.

The chemicals that is transferred between two neurons is known as neurotransmitter and the process is known as neurotransmission.

The brain consists of multiple neurons and this is how the information is transferred across the brain and body.

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3 years ago