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2 years ago

The muscles of the stomach aid in _____ digestion

1 answer:

6 0

As food reaches the end of the esophagus, it enters the stomach through a muscular valve called the lower esophageal sphincter. The stomach secretes acid and enzymes that digest food. Ridges of muscle tissue called rugae line the stomach. The stomach muscles contract periodically, churning food to enhance digestion.Mar 4, 2016

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Imagine that part of a population of flies is blown from the California coast to an offshore island. The island flies have no co

Serga [27]

Answer:

Speciation didn't occur over the past 10,000 years

Explanation:

We conclude this, since the two populations could mate (if speciation occurred, there would be no reprodution).

For example, in allopatric speciation which occurs as a result of geographic isolation, the part of population becomes physically separated from the initial main population. There is no gene flow between these two populations and as a result the two populations reach a high level of genetic divergence. They can no longer interbreed (reproduction between them) which means they become two different species (speciation).

New populations evolve as result of mutation, genetic drift and natural selection.

4 0

3 years ago

1 Sequence List the sequence of steps that happens

JulsSmile [24]

Answer:

When a doctor strikes the child's kneecap:

The sensory receptors located in the tendon receive the stimulus.
Information travels by afferent pathway through the sensory component of motor nerve
The integration center, in the spinal cord, receives the information and sends a motor response by efferent pathway.
The quadriceps contracts and extends the leg.

Explanation:

The patellar reflex —by hitting the kneecap tendon—is an example of a reflex arc, which produces the extension of the leg over the knee as an involuntary response to the stimulus to strike the patellar tendon.

This reflex has five main components:

Receptor.
Sensitive fibers of a motor nerve (afferent pathway)
Spinal cord integration center.
Motor nerve fibers (efferent pathway).
Effector.

The reflex arc occurs because the stimulus received does not travel to the brain, but to the spinal cord, which causes the reflex response to be faster.

When the doctor strikes sensory neurons below the boy's kneecap, the following sequence of events occurs:

The sensory receptors located in the tendon receive the stimulus.
Information travels by afferent pathway through the sensory component of the femoral nerve.
The integration center, in the spinal cord, receives theinformation and sends a motor response by efferent pathway.
The quadriceps contracts and extends the leg.

The patellar reflex evaluates the integrality of the reflex arc at that level, whose synapse occurs between the lumbar segments of the spinal nerve L₂ and L₄.

6 0

3 years ago

How did theodor schwann contribute to the cell theory

ikadub [295]

Answer:

He established that the cell is the basic unit of all living things.

Explanation:

Theodor Schwann was an anatomist and physiologist who is best known for developing the cell doctrine that all living things are composed of cells. He established that the cell is the basic unit of all living things. He believed that cells are governed by scientific processes and rejected vitalism which invoked the presence of some special energy or vital spark that only living things possessed.

His classification of different cells is the foundation of modern histology.

Schwann discovered the enzyme pepsin and discovered glial cells in nerves – these are now known as Schwann cells. He also identified the role that microorganisms play in alcohol fermentation.

6 0

2 years ago

which molecule are often embedded within the lipid bilayer substance mob=ve help substance move through the membrane

NeX [460]

Proteins are often embedded within the bilayer to help move subtances through the membrane. There are integral proteins, which are like channels that span the width of the membrane, and there are peripheral proteins, which are embedded on one side but act as carriers to move substances through.

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3 years ago

What is the full meaning of UPS

Flura [38]

UnitedStates postal service

8 0

2 years ago

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