The following is a list of several levels of organization that make up the human body.

      1. tissue

      2. cell

      3. organ

      4. molecule

      5. organism

      6. organ system

The correct order from the smallest to the largest is:

The absolute refractory period prevents a second action potential from occurring while Na⁺ channels are inactivated. What is its main purpose?

The plasma membrane allows certain substances to pass while restricting others. This property is best described as:

Select one:

Local electrical signals generated in neurons can vary depending on the strength of synaptic input. Which statement correctly describes a property of these signals?

Select one:

During excitatory synaptic input, sodium channels open and the membrane potential of a neuron moves from −70 mV toward −55 mV, increasing the likelihood that an action potential will occur.

What term best describes this change in membrane potential?

Which of the following choices about the effects of massage on cardiovascular system is incorrect?  

A type of muscle tissue is responsible for pumping blood and displays coordinated contractions due to specialised cell junctions. Which description best matches this tissue?

Select one:

Certain anatomical regions require extra caution during massage due to the presence of major blood vessels and reflex‑sensitive structures. Which area is considered high‑risk and should be avoided or treated with caution?

Select one:

We have two beakers:

The left one contains 4 mM NaCl, 9 mM glucose and 10 mM albumin. The right beaker contains 10 mM NaCl, 10 mM glucose and 40 mM albumin. The dialysis membrane is permeable to all substances except albumin. In which direction will water move?

Which of the following best explains how edema develops?